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First thing to think is anything that can get wet. Any outdoor lights/sockets top of the list for trouble. Washing Machine/Dishwasher are possibilities. Could just be damp in the walls penetrating a cable and causing the insulation resistance to break down. You need an IR tester to track those down.
Airhead
@Howard
Ugh, something is tripping the main Protected Circuits RCD at our gaff. Trouble is, it does it at night. so the lights go off in the kids rooms which freaks them out resultant in freaked out kids and double freaked out parents.
I'm looking suspiciously at the tumble dryer, but although the first time it happened it was on, the second time it happened it was on timer.