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Nuisance tripping in domestic situations. Always check for water, most often the problem originates outside. Don't rule out someone connecting outside electrics from any interior supply.
There are plenty of possible problems. Just recently I had a system tripping because damp in the walls had destroyed the cables over a long period of time. Testing the insulation resistance confirmed this but ir testers are not usually in the diy toolbox.
Airhead-
I'd had a serious leak near there (it's directly below where the extension's flat roof meets the back wall) back in August. Definitely seems worthy of suspicion but would be weird considering it was fixed and there's been no other evidence of moisture since.
@grams discovered it's possible to unclip the springs with pliers, they drop straight down then. No extractor fan in the toilet, it's separate from the bathrooom.
Brun
My lighting suddenly tripped its circuit breaker last night, not when actually switching anything on/off. Trial and error revealed it's the toilet which is just two GU10s in the ceiling.
Thinking it might be caused by a faulty bulb I've removed them both, but it's still tripping when I switch it on.
Expecting to have to get someone in, but is there anything else obvious I could check beforehand? Might take a quick look at the state of the wiring at the switch, but beyond that I'm a bit stumped.