London sees hottest stretch since 1960s
Central London has seen the longest stretch of high temperatures in almost six decades, as more thunderstorms are forecast across the UK.
The Met Office has said temperatures surpassed 34C in the capital for the sixth day in a row - the first time that has happened since at least 1961.
A yellow storm warning is in place for the whole of England, Wales and parts of Scotland on Wednesday.
Those regions could see flooding, travel disruption and power cuts.
The Met Office also warned of potential damage to buildings from lightning strikes or strong winds, and 30 to 40mm of rain falling in less than an hour in some places.
The yellow warning is in place for much of England and Wales until Monday night next week.
• More homes without water as heatwave continues
It comes after torrential rain and lightning lashed large parts of Scotland on Tuesday night.
Three people have died after a passenger train derailed near Stonehaven in Aberdeenshire. It is thought the train hit a landslide after heavy rain and thunderstorms.
A major incident was also declared in Fife.
The Scottish Fire and Rescue Service said it received more than 1,000 emergency calls overnight due to the severe weather.
Ten properties in Lancashire were also affected by flooding following overnight storms, according to the Environment Agency.
However, hot weather has persisted elsewhere in the UK.
Devon and Cornwall Police warned the south west of England is "full to capacity", leading to "unprecedented demand" for 999 services.
The force said it ...
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