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Here's the unit:
RCD trips each time I lift the one to the right of it.
It looks like it's just sockets in the kitchen as the lights / sockets work everywhere else in the house. Like I said though, everything has been turned off and removed from the sockets and it's still tripping.
Given the weather, I'm worried some water has gotten in somewhere but I can't see anything.
main RCD, or split board RCD, or circuit RCD?
Turn all circuit breakers (CB) off, reset RCD(s), systematically restore CBs until relevant RCD operates.
Can often be a failed lamp that trips an RCD.
If all that to no avail and not a plugged in item (99.9% of the time it's plugged in eqpt), then you're down to a fixed wiring issue, which is faceplates/roses off and isolating legs of each circuit until you find the rogue area.
fun...