These are all the workers that plan to go on strike over the Christmas period

Updated: 

As the lead-up to Christmas builds, so does the pressure on businesses whose staff have said they're going on strike at the busiest time of year.

While Argos managed to quickly curb the threat of a delivery drivers strike after workers accepted a pay deal, there's not been such progress with some of the other companies as talks have broken down.

These are the workers who've recently announced they're still planning to walk out and why they're doing so:

Airport workers

Gatwick Airport (Nick Ansell/PA)
(Nick Ansell/PA)

Who? Around 1,500 check-in staff, baggage handlers and cargo crew at 18 airports.

Why? Unite union members said their three-year pay deal is barely in line with inflation, and that detrimental T&C changes (like freezing overtime) have been linked in with the deal.

When? December 23 and Christmas Eve.

BA cabin crew

British Airways aircraft at Heathrow Airport (Steve Parsons/PA)
(Steve Parsons/PA)

Who? Around 4,500 so-called mixed fleet cabin crew who joined BA in 2010.

Why? Unite said they're on lower pay than other staff.

When? Christmas Day and Boxing Day.

Virgin Atlantic pilots

Virgin Atlantic Airways Airbus (Steve Parsons/PA)
(Steve Parsons/PA)

Who? The PPU union (which claims to represent 70% of Virgin's 900 pilots) said 88% of its members voted in favour of the strike (with a turnout of 80%).

They're going to work "strictly to contract" which means there'll be no "pilot goodwill."

Why? They're in a row over union recognition - the PPU wants to be the only union Virgin deals with, and for the British Airline Pilots Association (Balpa) to be de-recognised.

When? December 23.

Southern Railway drivers

Southern trains (Kirsty O'Connor/PA)
(Kirsty O'Connor/PA)

Who? Members of the RMT and Aslef unions. Last week's strikes led to Southern cancelling all of its 2,242 weekday services, affecting around 300,000 passengers.

Why? The company is involved in a seriously bitter row over over driver-only trains and changes to the role of conductors.

When? Conductors - December 19 and 20, and December 31 - January 2; Drivers - January 9 - 14.

Post Office workers

a Post Office sign (Lewis Stickley/PA)
(Lewis Stickley/PA)

Who? Around 4,000 Post Office workers.

Why? The union is embroiled in a row over job losses, the closure of a final salary pension scheme, and the closure of Crown Offices which means services have been transferred to firms like WH Smith.

When? Five-day strike from December 19 and, although it's the sixth day, the union has said it will include Christmas Eve.