Thunderstorm warnings remain in place for large parts of the UK after heavy downpours and flash flooding brought disruption to roads and railways.
The Met Office has issued yellow thunderstorm warnings until Monday, with the potential for flooding and damage to buildings from lightning and hail.
Severe thundery showers are expected in parts of Wales and southern England on Friday, following stormy scenes and sweltering temperatures across parts of the country this week.
The Roads Policing Unit for Surrey Police tweeted the M25 was closed between junction six and eight to allow authorities to pump water off the road and allow those trapped on the hard shoulder to make their way through.
Meanwhile, 19 people were evacuated from a train which became stuck following a landslide, according to British Transport Police.
The train came to a halt between West Malling and Borough Green in Kent and rescue attempts were hindered by localised flooding, Network Rail said.
A tweet by Network Rail Kent and Sussex said teams would be working overnight to clear mud which was washed onto the railway by torrential rain in the area.
Devon and Somerset Fire and Rescue Service said on Twitter it had received numerous calls relating to flooding in properties in Devon, with some residents reporting up to 18 inches of water inside their properties.
Six flood alerts, which mean flooding is possible, were issued by the Environment Agency for parts of the West Midlands, including the River Blythe in Warwickshire.
Hammersmith Bridge in the capital was closed to pedestrians and cyclists after safety inspectors said cracks in the the 133-year-old structure worsened during the heatwave.
It was the first time temperatures have not gone above 30C (86F) in seven days, according to the Met Office.
Overnight into Friday, there is a further risk of storms across the south, particularly in the West Country and South Wales, while conditions are likely to remain humid.
A yellow thunderstorm warning issued for Friday covering Wales and much of England has been extended until midday on Saturday, with further thunderstorms expected.
It will be a cloudy start for many on Friday, particularly across central and eastern England.
Towards the west, including Northern Ireland, north west England and western Scotland, Friday is likely to be another day of sunshine, according to Mr Box.