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One in five flights will be cancelled during a two-hour period at Heathrow today due to thundery weather, the airport has said.
A spokeswoman said: "There is severe weather forecast at Heathrow with a 70% risk of thunderstorms, lightning strikes and hail storms. During thunderstorms the number of aircraft that can take off and land each hour is reduced.
"We have therefore requested that airlines reduce their flight schedule by 20% between 4pm and 6pm. Passengers due to travel on July 19 are urged to check the status of their flight with their airline before travelling to the airport."
Gravesend was the hottest place today (and this year) peaking at 32.3C (90F). St James Park got to 31.8C.
Video courtesy of www.whodunnknit.com
Police in north London were left with no choice but to smash the windows of this car when they found a dog trying to shelter on the pedals.
The owners of the car near Finsbury Park returned to find the back window shattered.
Neighbours say they saw a "fireball" and sound like a "bomb exploding" during the lightning strikes in Streatham.
Latest ITV News reports
A lightning bolt struck a TV aerial attached to a chimney stack. It dislodged a brick that crashed through the conservatory.
It seems thousands of people were woken up by loud claps of thunder, seemingly constant flashes of lightning and torrential rain.