SNP calls for Cummings investigation in letter to civil service chief

SNP Westminster leader Ian Blackford has called on the head of the civil service to investigate the "rule-breaking and the Tory Government's cover-up" of Dominic Cummings' lockdown journey to Durham.

The Prime Minister's top aide has come under fire after it emerged he had driven 250 miles despite the guidelines on travelling – and showing symptoms of coronavirus.

In the letter to Sir Mark Sedwill and Boris Johnson, Mr Blackford highlights the "matter of serious public concern" with several questions for the PM including when he found out about the trip and what role the UK Goverment played in "keeping the public in the dark for eight weeks".

He also continued his calls for Mr Cummings to resign over the fiasco, stating his position as "completely untenable".

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MAESYCWMMER, WALES - MAY 29: A customer waits to pick up her order from Fish Kitchen 1854, a traditional fish and chip shop which has reopened for online orders only on May 29, 2020 in Maesycwmmer, Wales, United Kingdom.The British government continues to ease the coronavirus lockdown by announcing schools will open to reception year pupils plus years one and six from June 1st. Open-air markets and car showrooms can also open from the same date. (Photo by Huw Fairclough/Getty Images)
A woman walks past closed shops and restaurants on Piccadilly in central London's main high street retail shopping area on May 29, 2020 ahead of some shops reopening from their coronavirus shutdown from next week. - The UK Prime Minister announced on May 28 that some English schools and shops would reopen from next week people would a little more freedom to meet others in public as he tried to plot Britain's path through a health disaster that has officially claimed 37,837 lives -- second only to the United States -- and devastated the economy. (Photo by Tolga AKMEN / AFP) (Photo by TOLGA AKMEN/AFP via Getty Images)
Police officers patrol as people enjoy the weather at Alexandra Palace, London, after the introduction of measures to bring the country out of lockdown. (Photo by Ian Hinchliffe/PA Images via Getty Images)
A woman walks past closed Debenhams department store on Oxford Street in central London's main high street retail shopping area on May 29, 2020 ahead of some shops reopening from their coronavirus shutdown from next week. - The UK Prime Minister announced on May 28 that some English schools and shops would reopen from next week people would a little more freedom to meet others in public as he tried to plot Britain's path through a health disaster that has officially claimed 37,837 lives -- second only to the United States -- and devastated the economy. (Photo by Tolga AKMEN / AFP) (Photo by TOLGA AKMEN/AFP via Getty Images)
LONDON, ENGLAND - MAY 29: A couple with cycles meet in front of a fountain in Trafalgar Square during warm sunny weather on May 29, 2020 in London. The British government continues to ease the coronavirus lockdown by announcing schools will open to reception year pupils plus years one and six from June 1st. Open-air markets and car showrooms can also open from the same date. (Photo by Jo Hale/Getty Images)
LONDON, UNITED KINGDOM - MAY 28, 2020: NHS staff stage a silent protest outside the gates of Downing Street during the weekly 'Clap for our Carers' applause for the NHS and key workers on the front line of the coronavirus (Covid-19) pandemic on 28 May, 2020 in London, England.- PHOTOGRAPH BY Wiktor Szymanowicz / Barcroft Studios / Future Publishing (Photo credit should read Wiktor Szymanowicz/Barcroft Media via Getty Images)
Former nurse Joan Rich, 101, walks through Allenby Park in Felixstowe, Suffolk, to raise money for NHS Charities Together. Mrs Rich, who uses a frame to aid her walking, aims to walk 102 laps of the park before her 102nd birthday on 11 September. (Photo by Joe Giddens/PA Images via Getty Images)
A woman, Tina Jane from Shoreham, sings songs out the back of her car to entertain the people that live on her street after the Clap for Carers, as the UK continues to ease out of lockdown to curb the spread of coronavirus.
LIVERPOOL, UNITED KINGDOM - MAY 28: People enjoy the warm and sunny weather relaxing on the pavement outside their homes in the Shorefields area of Liverpool during the Coronavirus pandemic lockdown on May 28, 2020 in Liverpool, United Kingdom. The British government continues to ease the coronavirus lockdown by announcing schools will open to reception year pupils plus years one and six from June 1st. Open-air markets and car showrooms can also open from the same date. (Photo by Christopher Furlong/Getty Images)
LIVERPOOL, ENGLAND - MAY 28: Fire and explosion damage can be seen on an EE network 5G mast that was attacked by an arsonist earlier this week in Brodie Avenue on May 28, 2020 in Liverpool, England. A lot of the damage was caused by the resulting explosion when the petrol was ignited. Several phone masts have been deliberately damaged around the UK, their attackers inspired by a conspiracy theory positing that 5G technology is linked to the spread of the coronavirus. (Photo by Christopher Furlong/Getty Images)
People buy fresh fruit and vegetables from a stall in an outdoor street market in Walthamstow, east London on May 28, 2020, during the COVID-19 pandemic. - Britain has suffered the highest death rate from the coronavirus among the most-affected countries with comparable tracking data, according to Financial Times research published Thursday. (Photo by Tolga AKMEN / AFP) (Photo by TOLGA AKMEN/AFP via Getty Images)
Cleaner James York from First Bus cleans a bus at their Larbert depot ahead of the bus returning to service. Due to social distancing measures only a certain amount of people will be able to travel on a particular bus at a certain time after the introduction of measures to bring the country out of lockdown. (Photo by Andrew Milligan/PA Images via Getty Images)
A man wearing a protective mask strolls across a bridge in central London, Tuesday, May 26, 2020, during hot weather following the gradual easing of the COVID-19 lockdown, allowing more outdoor recreation and letting some shops and businesses reopen. (AP Photo/Frank Augstein)
GLASGOW - MAY 27: Members of the public walk past new graffiti on Clyde Street on May 27, 2020 in Glasgow, United Kingdom. The British government continues to ease the coronavirus lockdown by announcing schools will open to reception year pupils plus years one and six from June 1st. Open-air markets and car showrooms can also open from the same date. (Photo by Jeff J Mitchell/Getty Images)
People walk along Portobello Road Market in London, Wednesday, May 27, 2020. Following the gradual easing of the COVID-19 lockdown, street markets will be allowed to reopen in Britain from Monday onwards. (AP Photo/Frank Augstein)
Shop owners wait for customers and prepare at Sherpherd's Bush Market in London, Wednesday, May 27, 2020. Following the gradual easing of the COVID-19 lockdown, street markets will be allowed to reopen in Britain from Monday onwards. (AP Photo/Frank Augstein)
Dominic Cummings, the chief advisor to Britain's Prime Minister Boris Johnson, arrives at Downing Street in London, Wednesday, May 27, 2020. The prime minister's populist appeal has been hammered by news that, as the coronavirus outbreak raged, chief adviser Cummings drove 250 miles (400 kilometers) to his parents' house while he was falling ill with suspected COVID-19 — allegedly flouting lockdown rules that the government had imposed on the rest of the country. (AP Photo/Matt Dunham)
A workman removes graffiti from a wall near the north London home of the Prime Minister's top aide Dominic Cummings as the row over his Durham trip during the coronavirus lockdown continues.
A sign displaying advice on social distancing is displayed at the beach in Weston-super-Mare, south west England on May 27, 2020, as lockdown measures are eased during the novel coronavirus COVID-19 pandemic. (Photo by Adrian DENNIS / AFP) (Photo by ADRIAN DENNIS/AFP via Getty Images)
CHEAM, ENGLAND - MAY 27: AFC Wimbledon Footballer Jack Rudoni trains at home during the Coronavirus Pandemic on May 27, 2020 in Cheam, England. (Photo by Andrew Redington/Getty Images)
Cleaner James York from First Bus cleans a bus at their Larbert depot ahead of the bus returning to service. Due to social distancing measures only a certain amount of people will be able to travel on a particular bus at a certain time after the introduction of measures to bring the country out of lockdown. (Photo by Andrew Milligan/PA Images via Getty Images)
Number 10 special advisor Dominic Cummings leaves his residence in north London on May 26, 2020. - British Prime Minister Boris Johnson's top adviser Domonic Cummings said yesterday he acted "reasonably and legally" despite mounting pressure on him to resign for allegedly breaking coronavirus lockdown rules. (Photo by DANIEL LEAL-OLIVAS / AFP) (Photo by DANIEL LEAL-OLIVAS/AFP via Getty Images)
LONDON, UNITED KINGDOM - 2020/05/25: A man sunbathes in London on a very hot and sunny day. The UK government has started to ease the coronavirus lockdown allowing people to spend more time outdoors. (Photo by Steve Taylor/SOPA Images/LightRocket via Getty Images)
CILFYNYDD, WALES - MAY 26: A general view of a car sales showroom which is currently closed for business on May 26, 2020 in Blackwood, United Kingdom. The British government continues to ease the coronavirus lockdown by announcing schools will open to reception year pupils plus years one and six from June 1st. Open-air markets and car showrooms can also open from the same date. (Photo by Huw Fairclough/Getty Images)
LONDON, ENGLAND - MAY 24: Social Distancing measures are seen on a Bakerloo line tube train on May 24 2020 in London, England. The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by Peter Summers/Getty Images)
Team GB taekwondo athlete Lutalo Muhammad trains at his home in Walthamstow, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 24, 2020. REUTERS/Paul Childs TPX IMAGES OF THE DAY
The Young Westminster Foundation (YWF), a charity that supports young people in the Westminster Borough, unveil their new and original digital artwork by the graffiti artist STIK on the Piccadilly Lights screen, at Piccadilly Circus, central London. (Photo by Jonathan Brady/PA Images via Getty Images)
LONDON, UNITED KINGDOM - 2020/05/24: A view of a coronavirus awareness mural and a tribute to NHS workers drawn on a wall during the coronavirus crisis. (Photo by Dave Rushen/SOPA Images/LightRocket via Getty Images)
LONDON, UNITED KINGDOM - MAY 24, 2020 - Coronavirus: pavement stickers indicating the correct social distancing whilst queuing- PHOTOGRAPH BY Matthew Chattle / Barcroft Studios / Future Publishing (Photo credit should read Matthew Chattle/Barcroft Media via Getty Images)
PORTHCAWL, UNITED KINGDOM - MAY 25: A surfer in the water at Sandy Bay on May 25, 2020 in Porthcawl, United Kingdom. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Matthew Horwood/Getty Images)
LONDON, ENGLAND - MAY 24: Chief Advisor to Prime Minister Boris Johnson, Dominic Cummings arrives home on May 24, 2020 in London, England. On March 31st 2020 Downing Street confirmed to journalists that Dominic Cummings was self-isolating with COVID-19 symptoms at his home in North London. Durham police have confirmed that he was actually hundreds of miles away at his parent's house in the city. (Photo by Peter Summers/Getty Images)
A police officer talks to a protester outside the north London home of Prime Minister Boris Johnson's senior aide Dominic Cummings , as lockdown questions continue to bombard the Government after it emerged that he travelled to his parents' home despite coronavirus-related restrictions. (Photo by Victoria Jones/PA Images via Getty Images)
Mounted police patrol Barry Island, Wales, where the stay at home message is still in force and only essential travel is allowed. (Photo by Ben Birchall/PA Images via Getty Images)
A Long Eaton (Derbyshire) resident and NHS worker presents a Tribute and Memorial to the dedicated members of the NHS and Social Care family who gave their lives during the fight against COVID-19. (Photo by Scott Wilson/PA Images via Getty Images)
SALISBURY, ENGLAND - MAY 24: Team GB Olympic Trap Shooter Augusta Campos-Martyn trains at her home on May 24, 2020 in Salisbury, England. (Photo by Alex Davidson/Getty Images)
A man feeds a swan in Hyde Park, London, after the introduction of measures to bring the country out of lockdown. (Photo by Kirsty O'Connor/PA Images via Getty Images)
People sit in their vehicles as they wait at a KFC in Killingworth North Tyneside, after the introduction of measures to bring the country out of lockdown. (Photo by Owen Humphreys/PA Images via Getty Images)
BIGBURY-ON-SEA, ENGLAND - MAY 23: An NHS heart is drawn in the sand at Bigbury Beach on May 23, 2020 in Bigbury-on-Sea, England. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Dan Mullan/Getty Images)
BIGBURY-ON-SEA, ENGLAND - MAY 23: Kitesurfers enjoy the windy conditions at Bigbury Beach on May 23, 2020 in Bigbury-on-Sea, England. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Dan Mullan/Getty Images)
A woman sits alone on a bench under a tree at the top of Cissbury Ring, Worthing, after the introduction of measures to bring the country out of lockdown due to the coronavirus pandemic.
Two women walk through a heavy rain shower in St James's Park in central London, on the first day of the Bank Holiday weekend, as people flock to parks and beaches with lockdown measures eased.
A view of a near empty beach in Brighton as the hot weather cools following scenes of people flocking to parks and beaches this week as lockdown measures were eased.
Shoppers wearing protective masks in a farmers market in West Ealing, London during the coronavirus crisis. Photo date: Saturday, May 23, 2020. Photo credit should read: Richard Gray/EMPICS
People sit in their vehicles as they wait at a KFC in Killingworth North Tyneside, after the introduction of measures to bring the country out of lockdown.
Kitesurfer and windsurfers in Bowleaze Cove in distance in Weymouth, Dorset
Surfers in Bowleaze Cove in Weymouth, Dorset
Member of the public taking a walk along the seafront in Swanage, Dorset
Painted stones in support of the NHS in Swanage, Dorset
LONDON, UNITED KINGDOM - MAY 21, 2020: Paramedics and local residents clap their hands outside Chelsea and Westminster Hospital during the weekly 'Clap for our Carers' applause for the NHS and key workers on the front line of the coronavirus (Covid-19) pandemic as the UK's nationwide lockdown continues for the ninth week on 21 May, 2020 in London, England.- PHOTOGRAPH BY Wiktor Szymanowicz / Barcroft Studios / Future Publishing (Photo credit should read Wiktor Szymanowicz/Barcroft Media via Getty Images)
LONDON, UNITED KINGDOM - MAY 21, 2020: Nurses clap their hands outside Chelsea and Westminster Hospital during the weekly 'Clap for our Carers' applause for the NHS and key workers on the front line of the coronavirus (Covid-19) pandemic as the UK's nationwide lockdown continues for the ninth week on 21 May, 2020 in London, England.- PHOTOGRAPH BY Wiktor Szymanowicz / Barcroft Studios / Future Publishing (Photo credit should read Wiktor Szymanowicz/Barcroft Media via Getty Images)
Members of the public participate in a national "clap for carers" to show thanks for the work of Britain's NHS (National Health Service) workers and other frontline medical staff around the country as they battle with the novel coronavirus pandemic, at Chelsea and Westminster Hospital in London on May 21, 2020. - The British government on on May 21 announced that foreign care workers would be exempt from a charge imposed on migrants to fund the health service, after an outcry sparked by the coronavirus outbreak. (Photo by Niklas HALLE'N / AFP) (Photo by NIKLAS HALLE'N/AFP via Getty Images)
Members of the public participate in a national "clap for carers" to show thanks for the work of Britain's NHS (National Health Service) workers and other frontline medical staff around the country as they battle with the novel coronavirus pandemic, at Chelsea and Westminster Hospital in London on May 21, 2020. - The British government on on May 21 announced that foreign care workers would be exempt from a charge imposed on migrants to fund the health service, after an outcry sparked by the coronavirus outbreak. (Photo by Niklas HALLE'N / AFP) (Photo by NIKLAS HALLE'N/AFP via Getty Images)
Staff outside Abbeydale Court Care Home in Hamilton clapping to salute local heroes during Thursday's nationwide Clap for Carers initiative to recognise and support NHS workers and carers fighting the coronavirus pandemic. (Photo by Andrew Milligan/PA Images via Getty Images)
An Irish dancer performs outside the Belfast City Hospital in south Belfast, during Thursday's nationwide Clap for Carers initiative to recognise and support NHS workers and carers fighting the coronavirus pandemic. (Photo by Niall Carson/PA Images via Getty Images)
LONDON, ENGLAND - MAY 21: Swimmers in the Serpentine in Hyde Park on May 21, 2020 in London, United Kingdom. This week temperatures reached 28 degrees celsius in the UK, as many people enjoy the sunshine despite lockdown still being in place due to the COVID-19 outbreak. (Photo by Dan Kitwood/Getty Images)
Workers unload a shipment of 120,000 surgical coveralls from China for the protection of NHS workers, from a plane at Bournemouth Airport in southern England on May 21, 2020, during the novel coronavirus pandemic. - British Prime Minister Boris Johnson said Wednesday the country will have 25,000 virus tracing staff recruited by June so the country can "make progress" in its strategy to keep easing the nationwide lockdown (Photo by Glyn KIRK / AFP) (Photo by GLYN KIRK/AFP via Getty Images)
Social distancing queue at the home and outdoor store Homebase garden centre under Coronavirus lockdown on 21st May 2020 in Birmingham, England, United Kingdom. DIY shops have been allowed to be open for the last few days and flocks of people have queued at them to buy home and garden goods. Coronavirus or Covid-19 is a new respiratory illness that has not previously been seen in humans. While much or Europe has been placed into lockdown, the UK government has put in place more stringent rules as part of their long term strategy, and in particular 'social distancing'. (photo by Mike Kemp/In PIctures via Getty Images)
LEE-ON-THE-SOLENT, ENGLAND - MAY 19: A paramedic is seen wearing PPE as she waits outside an ambulance to monitor an incident at on May 19, 2020 in Lee-On-The-Solent, England. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Naomi Baker/Getty Images)
ENFIELD, ENGLAND - MAY 20: Equipment is disinfected between training sessions during the Tottenham Hotspur training session at Tottenham Hotspur Training Centre on May 20, 2020 in Enfield, England. (Photo by Tottenham Hotspur FC/Tottenham Hotspur FC via Getty Images)
Cars queue at the McDonald's drive-thru in Hounslow as McDonalds has reopened three of its restaurants in London but only as drive-thrus after the introduction of measures to bring the country out of lockdown. (Photo by Yui Mok/PA Images via Getty Images)
A man in a face mask walks in front of a mural of a nurse with a PPE face mask on, painted by the artist Akse in Manchester's Northern Quarter, UK on 19th May 2020. (Photo by Pat Scaasi/MI News/NurPhoto via Getty Images)
MANCHESTER, UNITED KINGDOM - MAY 19: 7-year-old Saskia Brunskill, the photographer's daughter, in action during a social distancing tennis coaching session with Shaun Murray at Sale Sports Club on May 19, 2020 in Sale, Greater Manchester, United Kingdom. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Clive Brunskill/Getty Images)
FLEET, ENGLAND - MAY 19: A general view of a thank you sign in support of NHS and key workers is displayed on a fence outside a house on May 19, 2020 in Fleet, England. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Alex Burstow/Getty Images)
LONDON, ENGLAND - MAY 19: A quiet view of Tower Bridge from St Katherine's Dock on May 19, 2020 in London. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Jo Hale/Getty Images)
Neonatal Nurse Kirsty Hartley carries premature baby Theo Anderson to his mother Kirsty Anderson in the Neonatal Intensive Care Unit at the Lancashire Women and Newborn Centre at Burnley General Hospital in Blackburn, England, amid the coronavirus pandemic. (Hannah McKay/Pool Photo via AP)
LONDON, ENGLAND - MAY 18: Toilets are taped off to help customers observe social distancing at Waterloo Station on May 18, 2020 in London, England. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Dan Kitwood/Getty Images)
A delivery worker rides his bike at Holborn, in London, Monday, May 18, 2020. Large areas of London are to be closed to cars and vans to allow people to walk and cycle safely as the coronavirus lockdown is eased. (AP Photo/Alberto Pezzali)
A sign advising passengers to wear a face mask at Clapham Junction station as train services increased as part of the easing of coronavirus lockdown restrictions, in London, Monday May 18, 2020.Britain's Prime Minister Boris Johnson announced last Sunday that people could return to work if they could not work from home. (Yui Mok/PA via AP)
A view of the M6 motorway near Birmingham, after the introduction of measures to bring the country out of lockdown amid the coronavirus pandemic, in Birmingham, England, Monday, May 18, 2020. Britain's Prime Minister Boris Johnson announced last Sunday that people could return to work if they could not work from home. (AP Photo/Rui Vieira)
Commuters, some wearing protective masks to protect against coronavirus stand on the platform at Leytonstone underground station, in London, Monday, May 18, 2020. Britain's Prime Minister Boris Johnson announced last Sunday that people could return to work if they could not work from home. (AP Photo/Alberto Pezzali)
BOLTON, UNITED KINGDOM - MAY 18: Barry Dieters poses wearing his face mask as he shops for essentials on May 18, 2020 in Bolton, United Kingdom. People are beginning to get back to work and try to get life back to a sense of normality as aspects of the lockdown are eased. The government has relaxed the lockdown meant to curb the spread of Covid-19, and has asked the public to wear face masks in enclosed spaces and where social distancing isn't possible. (Photo by Christopher Furlong/Getty Images)
BLACKWOOD, WALES - MAY 18: A general view of a Safety sign at Bryn Meadows Golf Club as restrictions on playing golf in Wales have been eased but still differ to golf in England on May 18, 2020 in Blackwood, Wales, United Kingdom. The British government has started easing the lockdown it imposed two months ago to curb the spread of Covid-19, abandoning its 'stay at home' slogan in favour of a message to 'be alert', but UK countries have varied in their approaches to relaxing quarantine measures. (Photo by Huw Fairclough/Getty Images)
SOUTHEND ON SEA, ENGLAND - MAY 17: People flock to the beach to enjoy the sunshine and warm weather during the coronavirus, covid-19 pandemic on May 17, 2020 in Southend on Sea, England . The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by John Keeble/Getty Images)
People queue for ice cream in Cambridge after the introduction of measures to bring the country out of lockdown.
Neonatal Nurse Kirsty Hartley carries premature baby Theo Anderson to his mother Kirsty Anderson in the Neonatal Intensive Care Unit at the Lancashire Women and Newborn Centre at Burnley General Hospital in East Lancashire during the outbreak of the coronavirus disease.
Kayakers return to the River Cam in Cambridge after the introduction of measures to bring the country out of lockdown.
Members of Marlow Rowing Club take to the River Thames at Marlow, Buckinghamshire, after the lifting of some restrictions to bring the country out of lockdown.
Pharmacist Susan Holgate talks on the telephone in the Critical Care Unit at The Royal Blackburn Teaching Hospital in East Lancashire during the outbreak of the coronavirus disease.
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A member of the social distancing team wears a face shield to protect from coronavirus as he watches to help construction workers observe social distancing at lunchtime in the site canteen at the "Goodluck Hope" development which is under construction by the Ballymore Group international property development company on Leamouth Peninsula in east London, Friday, May 15, 2020. Some of the coronavirus lockdown measures were relaxed in England on Wednesday, with those workers who are unable to work from home, such as those in construction and manufacturing, encouraged to return to work. (AP Photo/Matt Dunham)
A woman wears a face guard to protect against the coronavirus as she shops at a food market in London, as the country is in lockdown to help stop the spread of coronavirus, Thursday, May 14, 2020. Some of the coronavirus lockdown measures are being relaxed in England, with coffee shops reopening but with extra measures such as take away only and social distancing. (AP Photo/Kirsty Wigglesworth)
LONDON, UNITED KINGDOM - MAY 15, 2020: A social distancing floor marking and poster advising passengers to wear face covering on public transport are seen at Vauxhall underground station on 15 May, 2020 in London, England. Earlier this week the UK government relaxed some of the coronavirus lockdown restrictions in England , encouraging employees who can't work from home to gradually return to their workplaces and allowing people to leave home for outdoor leisure activities.- PHOTOGRAPH BY Wiktor Szymanowicz / Barcroft Studios / Future Publishing (Photo credit should read Wiktor Szymanowicz/Barcroft Media via Getty Images)
BLACKWOOD, WALES - 14 MAY: A general view of Cefn Caerllwyn Farm, where the owners have illuminated the side of a barn in support of the NHS on May 14, 2020 in Blackwood, Wales, United Kingdom. The barn is located on a hillside and the writing can be seen by residents and passing motorists. Following the success of the "Clap for Our Carers" campaign, members of the public are being encouraged to applaud NHS staff and NHS staff and other key workers from their homes at 8pm every Thursday. The Coronavirus (COVID-19) pandemic has infected over 4 million people across the world, claiming at least 33,614 lives in the U.K. (Photo by Huw Fairclough/Getty Images)
NHS workers wearing PPE (personal protective equipment), including a face mask, gloves and aprons, as a precautionary measure against COVID-19 participate in a national "clap for carers" to show thanks for the work of Britain's NHS (National Health Service) workers and other frontline medical staff around the country as they battle with the novel coronavirus pandemic, at Aintree University Hospital in Liverpool, north west England on May 14, 2020. - Britain on Thursday said it was in discussions with Swiss pharma giant Roche to mass purchase its coronavirus antibody test after scientists claimed it was "100 percent" accurate. "This test developed by Roche appears to be extremely reliable, it's got the green light from testers," health minister Edward Argar told the BBC on Thursday. (Photo by Oli SCARFF / AFP) (Photo by OLI SCARFF/AFP via Getty Images)
MANCHESTER, ENGLAND - MAY 14: A nurse dances as the Oldham Scottish and Manchester Community pipe bands perform during the Clap for Carers at Tameside General Hospital in Ashton-Under-Lyne on May 14, 2020 in Manchester, United Kingdom. The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by Anthony Devlin/Getty Images)
NHS workers outside the Royal London Hospital in Whitechapel, London, to salute local heroes during Thursday's nationwide Clap for Carers initiative to recognise and support NHS workers and carers fighting the coronavirus pandemic. (Photo by Yui Mok/PA Images via Getty Images)
MANCHESTER, ENGLAND - MAY 14: Local charity workers dressed as superheroes pose for a portrait after participating in the Clap for Carers at Tameside General Hospital in Ashton-Under-Lyne on May 14, 2020 in Manchester, United Kingdom. The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by Anthony Devlin/Getty Images)
Drummers outside the Queen Elizabeth Hospital, Birmingham, as they join in the applause to salute local heroes during Thursday's nationwide Clap for Carers to recognise and support NHS workers and carers fighting the coronavirus pandemic. (Photo by Jacob King/PA Images via Getty Images)
MANCHESTER, ENGLAND - MAY 14: Local charity workers dressed as superheroes wave at patients as they participate in the Clap for Carers at Tameside General Hospital in Ashton-Under-Lyne on May 14, 2020 in Manchester, United Kingdom. The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by Anthony Devlin/Getty Images)
Neighbours Seamus O'Sullivan, playing his accordion, and Ian Taylor, playing his guitar, in their street in Glasgow, as they join in the applause to salute local heroes during Thursday's nationwide Clap for Carers to recognise and support NHS workers and carers fighting the coronavirus pandemic. (Photo by Andrew Milligan/PA Images via Getty Images)
GLASTONBURY, ENGLAND - MAY 14: General view of Glastonbury Tor as it is lit up Blue as a mark of respect to the NHS and Key Workers on May 14, 2020 in Glastonbury, England. The prime minister announced the general contours of a phased exit from the current lockdown, adopted nearly two months ago in an effort curb the spread of Covid-19. (Photo by Harry Trump/Getty Images)
ABERTILLERY, WALES - 14 MAY: A resident and her pet dog Clap For Carers on May 14, 2020 in Abertillery, Wales, United Kingdom. Following the success of the "Clap for Our Carers" campaign, members of the public are being encouraged to applaud NHS staff and other key workers from their homes at 8pm every Thursday. The Coronavirus (COVID-19) pandemic has infected over 4 million people across the world, claiming at least 33,614 lives in the U.K. (Photo by Huw Fairclough/Getty Images)
Staff at the Coastline fish and chip shop and ice cream parlour on Blyth beach, Northumberland, wearing personal protective equipment (PPE) as they put out social distancing signs for customers. The restaurant has re-opened for take away orders after the easing of lockdown restrictions during the coronavirus pandemic. (Photo by Owen Humphreys/PA Images via Getty Images)
DARLASTON, UNITED KINGDOM - MAY 13: John Humphries poses wearing his face mask as he goes about essential chores on May 13, 2020 in Darlaston, West Midlands, United Kingdom. People are beginning to get back to work and trying to get life back to a sense of normality as aspects of the lockdown are eased. As the government relaxes the lockdown meant to curb the spread of Covid-19, it has asked the public to wear face masks in enclosed spaces and where social distancing isn't possible. (Photo by Christopher Furlong/Getty Images)
Graffiti in support of the NHS, near Waterloo Station, London, after the announcement of plans to bring the country out of lockdown. (Photo by Victoria Jones/PA Images via Getty Images)
TOPSHOT - Nurses who work at central London hospitals protest with placards outside Downing Street in central London on May 13, 2020 calling for improved conditions and pay for nursing staff on the occasion of International Nurses Day 2020 during the COVID-19 pandemic. - International Nurses Day 2020 coincides with the 200th anniversary of the birth of pioneering nurse Florence Nightingale and aims to shine a light on the difficult work done by nursing staff. The coronavirus pandemic has brought increased focus on the often extraordinary work of NHS clinical, non-clinical staff and care sector staff in caring for patients in challenging conditions with the public showing their appreciation with weekly 'claps for carers'. (Photo by Tolga AKMEN / AFP) (Photo by TOLGA AKMEN/AFP via Getty Images)
General view of a mural by artist Lionel Stanhope showing 'Supper at Emmaus' by Caravaggio, with the figures wearing protetive gloves, in south London, after the announcement of plans to bring the country out of lockdown. (Photo by Dominic Lipinski/PA Images via Getty Images)
A quiet 'rush hour' at Waterloo Station as the UK eases some restrictions in it's tenth week to help curb the spread of the coronavirus.
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Mr Blackford said: "I have written to Sir Mark Sedwill seeking an immediate investigation into the rule-breaking and the Tory Government's cover-up – and to call for Dominic Cummings to resign or be sacked.

"Boris Johnson must answer serious questions about his role in this incident and the cover-up – including when he found out, when he heard about the police action, why Mr Cummings wasn't sacked immediately, and why he kept the public in the dark for eight weeks until a newspaper broke the story.

"Dominic Cummings' position is completely untenable.

"This is a matter of leadership and judgment for the Prime Minister who must prevent lasting damage to his Government and his own reputation.

"Millions of us have made huge sacrifices over the months to obey the rules, while Boris Johnson's most senior adviser was breaking them.

"There cannot be one rule for the Tory Government and another for the rest of us."

Last month Scotland's then chief medical officer was forced to resign after being criticised for not adhering to social distancing advice.

Dr Catherine Calderwood apologised and was backed by First Minister Nicola Sturgeon to remain in the role, despite twice visiting her second home in Fife.

Photos of her and her family near a coastal retreat in Earlsferry – a drive of more than an hour from her main Edinburgh residence – were published in a national newspaper.

Mr Blackford also referred to Dr Calderwood's resignation and the reaction of the Scottish Conservatives in his reasoning for the letter addressing Mr Cummings' actions.

He added: "The excuses are not credible.

"There was absolutely nothing in the list of reasons under the law for leaving the house that allowed someone to travel the length of the country to stay with their parents, particularly not someone who was known to have the virus.

"The Tories vociferously demanded the resignation of Catherine Calderwood that same weekend.

"As Scottish Tory leader Jackson Carlaw said at the time 'There cannot be one rule for bosses and another for everyone else'.

"People are understandably questioning Boris Johnson's judgment. He must show Dominic Cummings the door and answer for his own role.

"Questions over the Tory cover up will only grow unless credible answers are provided – or until Mr Cummings is removed from his post."

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