Boris Johnson insisted there was no alternative to the coronavirus restrictions he has been forced to introduce as he promised to forge a new Britain "in the teeth of this pandemic".
The Prime Minister promised a revolution in green power generation, reforms to the social care system and improvements in education as he addressed the online Conservative Party conference.
But in the face of Tory unease about the state interventions imposed by the Government as a result of the virus, Mr Johnson insisted they were the only step he could take.
Mr Johnson said: "This Government has been forced by the pandemic into erosions of liberty that we deeply regret and to an expansion in the role of the state from lockdown enforcement to the many bailouts and subsidies that go against our instincts.
"But we accept them because there is simply no reasonable alternative."
He praised Chancellor Rishi Sunak as he sought to dispel speculation about a rift between the two over the response to the crisis.
"Rishi Sunak, the Chancellor, has come up with some brilliant expedients to help business, to protect jobs and livelihoods but, let's face it, he has done things that no Conservative chancellor would have wanted to do except in times of war or disaster."
Pictures of the week: October 4- 10
Pictures of the week: October 4- 10
People walk past a sign that refers to COVID-19 closures in London, Friday, Oct. 9, 2020. The British economy grew by far less than anticipated during August, raising concerns that the recovery from the coronavirus recession was already stuttering even before the reimposition of an array of lockdown restrictions. (AP Photo/Frank Augstein)
England's Danny Ings, laying on the pitch, scores his team's third goal, during the international friendly soccer match between England and Wales at Wembley stadium in London, Thursday Oct. 8, 2020. England won the match 3-0.(Glynn Kirk/Pool via AP)
Scotland's Kenny McLean, right, celebrates with Scotland goalkeeper David Marshall after scoring from a penalty shot during the Euro 2020 playoff semifinal soccer match between Scotland and Israel, at the Hampden stadium in Glasgow, Scotland, Thursday, Oct. 8, 2020. (AP Photo/Scott Heppell)
A man cycles past the Kalliopi Lemos �Bag of Aspirations� Mild steel and stainless steel, a giant handbag sculpture on display on the corner of New Bond Street and Brook Street in London. (Photo by Dave Rushen / SOPA Images/Sipa USA)
LONDON, ENGLAND - OCTOBER 07: Performers on the Ellis Island stage during the "Lockdown Town" Launch Night at One Night Records on October 07, 2020 in London, England. "Lockdown Town" is London's first socially-distanced immersive live music event and venue. (Photo by Tristan Fewings/Getty Images)
VIRGINIA WATER, ENGLAND - OCTOBER 08: Patrick Reed of The United States of America prepares to play his second shot on the 9th hole during Day One of the BMW PGA Championship at Wentworth Golf Club on October 08, 2020 in Virginia Water, England. (Photo by Andrew Redington/Getty Images)
EDITORIAL USE ONLY Claire Whitaker OBE, Southampton UK City of Culture Bid Director (2nd right) and Councillor Satvir Kaur (3rd right) are joined by musicians Tyrone (left) and Warbz (right), dancer and artistic director Zoie Golding (2nd left) and chef Shelina Permalloo (3rd left) launch Southampton's bid to become the UK City of Culture 2025, outside Southampton's Bargate.
The London Eye on the south bank of the river Thames, as the sun rises, in London, Wednesday, Oct. 7, 2020. (AP Photo/Alberto Pezzali)
A woman wears a face mask as she sits on a bus, in London, Wednesday, Oct. 7, 2020. Like other countries in Europe, the U.K. has seen rising coronavirus infections over the past few weeks, which has prompted the government to announce a series of restrictions, both nationally and locally, to keep a lid on infections. (AP Photo/Alberto Pezzali)
Tottenham Hotspur's Ria Percival, left, and London's Harley Bennett challenge for the ball during the women's Continental League Cup match between Tottenham Hotspur and London City Lionesses in London, Wednesday, Oct. 7, 2020. (AP Photo/Frank Augstein)
A primates head part of Patrick Goddard�s Humans-Animals-Monsters sculpture during the Frieze Sculpture 2020 exhibition at Regent's Park. (Photo by Dave Rushen / SOPA Images/Sipa USA)
BLACKPOOL, ENGLAND - OCTOBER 06: People wearing face masks play games in an amusement arcade on October 06, 2020 in Blackpool, England. This year to help boost the tourism trade, which has been hit by the Covid-19 pandemic, Blackpool Illuminations will remain on display until January, two months longer than normal. (Photo by Christopher Furlong/Getty Images)
NORTHWICH, UNITED KINGDOM - OCTOBER 06: A mannequin wearing a face mask and nurse's uniform stands next to a sign supporting the NHS, stands in a field during the Covid-19 pandemic on October 06, 2020 in Northwich, United Kingdom. (Photo by Christopher Furlong/Getty Images)
A woman in protective face mask is seen shopping by a stall at Lewisham street market as the second wave of Coronavirus hits London, England on October 6, 2020. (Photo by Dominika Zarzycka/NurPhoto via Getty Images)
Boscombe pier is silhouetted as dawn breaks over Boscombe beach in Dorset. (Photo by Andrew Matthews/PA Images via Getty Images)
Australian street artist James Cochran, also known as Jimmy C, poses for a portrait as he finishes working for the day, with just a coat of varnish left to finish applying on his London cityscape mural on a Network Rail wall by Blackfriars Station, in London, Monday, Oct. 5, 2020. It is the first time Cochran has painted a cityscape as a piece of street art outside of his studio and has taken six days to paint working through wet and rainy conditions. (AP Photo/Matt Dunham)
Two swimmers run into the sea as the sun rises over Boscombe beach in Dorset. (Photo by Andrew Matthews/PA Images via Getty Images)
Daniel Marc Hooper, better known as environmental activist Swampy, assists fellow anti-HS2 tree protectors from a makeshift tree house about sixty feet above ground at a wildlife protection camp in ancient woodland at Jones Hill Wood on 5 October 2020 in Aylesbury Vale, United Kingdom. The Jones Hill Wood camp, one of several protest camps set up by anti-HS2 activists along the route of the £106bn HS2 high-speed rail link in order to resist the controversial infrastructure project, is currently being evicted by National Eviction Team bailiffs working on behalf of HS2 Ltd. (photo by Mark Kerrison/In Pictures via Getty Images)
A surfer makes their way into the sea as the sun starts to rise over Boscombe beach in Dorset. (Photo by Andrew Matthews/PA Images via Getty Images)
Actress Jennifer Saunders, front center, and five colleagues carry out a 'silent stand' outside the Gielgud Theatre, London, Monday Oct. 5, 2020, on behalf of the UK theatre industry. The two minute stand is to show solidarity with those in the UK theatre industry who have lost their jobs and received no government support, to highlight the lack of government guidance for the reopening of theatres, an to ask the government to provide the industry with a date when theatres can reopen without social distancing. (AP Photo/Alastair Grant)
Japan's Hiroki Nishida in action during the Elite Wheelchair Race during the Virgin Money London Marathon around St James' Park. (Photo by Ian Walton/PA Images via Getty Images)
GALLOWAY, NEW JERSEY - OCTOBER 04: Mel Reid of England (C) is doused with champagne after winning the ShopRite LPGA Classic presented by Acer on the Bay Course at Seaview Hotel and Golf Club on October 04, 2020 in Galloway, New Jersey. (Photo by Michael Cohen/Getty Images)
Runners pass cardboard cutouts of Britain's Queen Elizabeth II and Prince William during the London Marathon in London, England, Sunday, Oct. 4, 2020. Athletes are competing on a 26.2-mile (42.2-kilometer) closed-loop course consisting of 19.6 clockwise laps around St. James' Park. The traditional course along the River Thames was scrapped because of the coronavirus pandemic and only elite men and women are competing and no spectators are permitted. (John Sibley/Pool via AP)
A resident in Rothbury in Northumberland bails water from their vehicle after the River Coquet burst its banks. The UK's wet weekend will continue as a weather warning for rain across parts of Wales and England has been extended.
Kenya's Brigid Kosgei, left, and Kenya's Ruth Chepngetich race along Horseguards Parade during the London Marathon in London, England, Sunday, Oct. 4, 2020. Athletes are competing on a 26.2-mile (42.2-kilometer) closed-loop course consisting of 19.6 clockwise laps around St. James' Park. The traditional course along the River Thames was scrapped because of the coronavirus pandemic and only elite men and women are competing and no spectators are permitted. (Adam Davy/Pool via AP)
A van is stuck in flood water after the Padbury brook burst its banks near Buckingham, England, Monday Oct. 5, 2020. Heavy rain over the weekend has brought flooding and travel disruption to parts of Britain. (Steve Parsons/PA via AP)
Cars make their way through a flooded road in Claudy, County Londonderry. The UK's wet weekend will continue as a weather warning for rain across parts of Wales and England has been extended.
Manchester United's manager Ole Gunnar Solskjaer reacts after Tottenham scored their sixth goal during the English Premier League soccer match between Manchester United and Tottenham Hotspur at Old Trafford in Manchester, England, Sunday, Oct. 4, 2020. (Oli Scarff/Pool via AP)
BIRMINGHAM, ENGLAND - OCTOBER 04: Ben Duckett and Dan Christian of Notts Outlaws celebrate victory in the Vitality Blast 20 Final between Surrey and Notts Outlaws at Edgbaston on October 04, 2020 in Birmingham, England. (Photo by Alex Davidson/Getty Images)
Mark Smith 25228 seen running past Downing Street, London taking part in the Virgin Money Virtual London Marathon running for the St Lukes Hospice. (Photo by Dave Rushen / SOPA Images/Sipa USA)
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The Prime Minister said the UK economy went into the pandemic with "chronic underlying problems" which he vowed to address.
"Long-term failure to tackle the deficit in skills, inadequate transport infrastructure, not enough homes people could afford to buy, especially young people.
"And far too many people across the whole country who felt ignored and left out, that the Government was not on their side.
"And so we can't now define the mission of this country as merely to restore normality, that isn't good enough.
"In the depths of the Second World War, when just about everything had gone wrong, the government sketched out a vision of the post-war new Jerusalem that they wanted to build, and that is what we're doing now, in the teeth of this pandemic."
The Prime Minister confirmed plans for a green energy revolution, performing a U-turn on his previous criticism of wind power.
He said the Tories would help people take their first step on the housing ladder with 95% mortgages, transforming "generation rent into generation buy".
Mr Johnson said: "We will transform the sclerotic planning system, we will make it faster and easier to build beautiful new homes without destroying the green belt or desecrating our countryside.
"But these reforms will take time and they are not enough on their own.
"We need now to take forward one of the key proposals of our manifesto of 2019: giving young, first-time buyers the chance to take out a long-term, fixed-rate mortgage of up to 95% of the value of the home, vastly reducing the size of the deposit."
He added: "We believe that this policy could create two million more owner-occupiers, the biggest expansion of home ownership since the 1980s."