London’s fire service had its busiest day since World War Two, dealing with multiple blazes in record-breaking temperatures on Tuesday, London Mayor Sadiq Khan has said.
The capital was one of 15 areas around the UK to declare a major incident.
The fires started on a day with a record temperature of 40.3C (104.5F) in Coningsby, Lincolnshire.
Wednesday has been cooler for most, but thunderstorms are forecast in central England.
A yellow warning has been issued by the Met Office for heavy showers and thunderstorms, which could bring disruption in eastern and south-east England on Wednesday evening.
Despite falling temperatures, the weather continues to affect transport, with Network Rail advising passengers to only travel if necessary.
By mid-afternoon, LNER services from London to Scotland were starting up again, while trains on the East Coast Mainline resumed after a fire in Bedfordshire.