Strike action by firefighters has been called off after progress was made in a dispute over pensions.
The walkout was due to last from 6.30 to 11.30pm tomorrow and reduce the number of fire engines operating in London from 169 to just 27.
The Fire Brigades Union said it had been presented with a similar deal to one made by the Scottish Government, covering the retirement of firemen and women aged between 55 and 60.
More top news
The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.