Flights were cancelled at Heathrow and London City airports on Monday morning as thick fog shrouded the capital.
A number of flights at London airports were cancelled on Monday morning, as thick fog covered the capital and forecasters warned visibility could fall to 50 metres or less.
A yellow weather warning, which covers London and most of the South East, was in place until 11am, and the Met Office warned of difficult travel conditions.
By 6.30am, seven flights from Heathrow and three from London City had been cancelled.
Niamh Murray, Met Office operational meteorologist, said current weather conditions are a “perfect recipe” for fog.
Motorists were urged to take extra care in the low-lying cloud after a crash involving more than 30 vehicles during foggy conditions saw the M20 in Kent closed for nearly 12 hours on Saturday.
The motorway was shut both ways between junctions 8 and 9 near Maidstone after the pile-up, which seriously injured two people.
AA president Edmund King said: “Fog can transform a familiar road in a matter of minutes, so drivers need to be prepared to adapt their speed and leave more room between themselves and the vehicle ahead.
“One of the biggest mistakes is simply following the rear lights of the car in front.
“It can give you a false sense of security and means you may be travelling too close to react safely if that vehicle suddenly stops.”
He added: “Give yourself extra time, slow down and drive to what you can actually see ahead.”
Thick fog was also seen across central London, with some of the capital’s most recognisable landmarks barely visible.
Along the River Thames, buildings and bridges were shrouded in mist, with visibility around the South Bank significantly reduced. Photos showed the Oxo Tower partially obscured by the fog, with buildings on the opposite side of the river fading into the grey skyline.
The same foggy conditions pushed London’s air pollution to the highest possible rating on Sunday, as Bonfire Night smoke combined with the fog. London recorded a 10 out of 10 “Very High” pollution rating on Sunday, and a yellow fog warning was in place for the capital until 11am on Monday.
