Clive Bull is Leading Britain's Conversation.
A huge clean-up operation has begun after a month's rain fell in just three hours in some parts of London and Surrey - with trapped people pulled out of cars by emergency services.
Three people had to be rescued from their cars as the floods hit areas including Wallington, Mitcham and Croydon:
Wallington right now smh mad mad pic.twitter.com/uMzESRCbzH— Make Noise (@roddaz_) June 7, 2016
A yellow "be aware" weather warning for rain is in place for much of the UK.
Stay tuned to LBC for the latest traffic and travel this evening.