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Update: electrician finally pinned it down to a fault in the cable, seemingly two cables, running from an indoor socket by the back door to an outdoor socket (NOT the one that was leaking), then from there back indoors again. He isolated the outdoor socket by disconnecting the ring at both...

No. Good idea, but while there is one, it's on a different circuit. It'd be really nice to discover a final dodgy appliance that I've forgotten about, but I think the in-socket 5V transformer was the last one.

Yep, the boiler is running with the kitchen MCB switched off. Notably, the RCD trips when I turn the kitchen circuit on, but the MCB remains on, although I guess that might just mean that the RCD gets there first. I think I've reached the limits of my diagnostic abilities, and it's time to call...

Yes, instantly.

Thanks! You're right, it indicates that I am very stupid - there's a USB outlet on that socket, so I guess I was measuring the transformer. I disconnected the live, and now there's high resistance. There's a second outdoor socket, but the seal was good on that one. I'm not aware of any spills...

I just found my multimeter, opened a socket up and got 65kΩ between earth and live. I'm not an electrician, but with nothing plugged in I'm guessing that means something has chewed through my wiring :( Oh, no, hang on a minute, scratch that - it's a socket with a USB port on it, so I was...

Hello! The RCD for our downstairs circuits tripped overnight. I narrowed it down to the MCB for the 'kitchen sockets', which seems to cover everything in the kitchen (except the boiler), plus two outdoor sockets. I switched off all sockets and isolators, and unplugged all appliances, but no...