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This any good? https://www.metoffice.gov.uk/hadobs/hadukp/index.html Though it looks like it only has data up until the end of May at the moment.
It rained in north London last night, but prior to that I believe the last rainfall would have been one day of heavy rain towards the end of May.
I googled for a few seconds, but couldn't find any website hosting historical precipitation records. :(