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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
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.