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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.
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.