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they insist on also providing an RCD plug adapter
Presumably it is tested on some sort of schedule? Aren't you supposed to test your RCD every 6 months? Hands up all the people that do that.
Do they actually fail often?
jellybaby-
I've had a few that don't operate within spec the first time you test them (using an rcd tester at a socket). They can become a bit sticky which is why you're supposed to press the little button every 6 months and then switch it back on. That button might say test but it's not testing the response time just the circuit breaking.
Airhead
I do remember you saying this but then it was a spark who was actually in my house so I'd rather blame someone who has been here rather than someone on the internet (not that I don't trust you, you've been a very helpful source of information). Also, all three times I've hired floor sanders (from two different places), they insist on also providing an RCD plug adapter without specifying it's only needed if your own house circuit is not already protected. That logic to me says "better safe than sorry", or "you'd rather have it an not need it, that need it and not have it", if that makes sense.