The London Underground (LU) strike could cause issues today for holidaymakers trying to get to Heathrow Airport.
The Tube is at a standstill as thousands of Underground staff walk out in protest at all-night services due to start in September.
Picket lines are mounted outside Tube stations by members of four trade unions involved in the action.
Extra coaches have been laid on to take passengers to Heathrow from Victoria Coach Station, and the Heathrow Express is still operating, but passengers have been warned services will be extremely busy.
It is thought the strike will cost the capital’s economy tens of millions of pounds.
Business leaders, the Government and London mayor Boris Johnson have all condemned the action, but unions say LU is to blame.
In response, LU managing director Mike Brown has defended the planned introduction of the night-time Tube service, saying the number of people using the Underground late at night has almost doubled in the past decade.
Overnight services can be run on Fridays and Saturdays on five lines from later this year because of investment in modernising the Tube network, he added.
He calls the strike “totally unnecessary” and says it will cause huge disruption in the capital.
Holidaymakers warned of Tube strike | iceplc.com | © Press Association 2015