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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.
Soul-
ok, ring fixed wiring suspect.
With the power off an electrician would take faceplates off and disconnect the first socket, then reapply power, and see if the fault manifested in the now radial circuit. If it doesn't then you know it's the cabling from CB to first socket, if it does, keep going along, moving the open point of the ring/radial until the fault is located.
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Like I said though, everything has been turned off and removed from the sockets and it's still tripping.
Including hidden sockets for integrated appliances (washing machine, dishwasher, etc) or ambient lighting (under/in cupboard style) wired into the sockets circuit?
The one time I had something similar it was an under-cupboard light (fluro tube) that had had steam blasted at it from the kettle too many times and would trip the main breaker whenever someone put the kettle on with it pointing in the wrong direction. Baffled the electrician for a while as the kettle tested fine on its own.
rive_gauche
Greenbank
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...