Despite the scorching temperatures, some of the storms that swept across the capital last night contained large hail stones.
Robbie Collin posted a picture on Twitter of his living room window, which had been smashed during a thunder storm.
He wrote: "Err, wow. A sudden hail shower in SW London has just SMASHED MY LIVING ROOM WINDOW."
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Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.
A total of 270,000 documents is expected to be submitted to the inquiry.