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wireless switch
edit: found the kind of thing now, good shout!
That's a good point actually, I've not got a label on the dishwasher one, but it turns out he just missed it because it's on the return wall. Still baffled as to what to do about the extractor, it's designed to be left running in trickle mode constantly, with humidistat just controlling the boost. As such I probably should should have left it on when he came round. Pretty pissed the guy who wired it up didn't mention any of this.
Polygon-
In fairness the regulations pertaining to the fan are probably buried deep in the big yellow book and it depends what you are remembering when you design vs what you remember when you're carrying out a test.
There's an IET website full of experienced electricians and testers who would probably love to start a 20 page thread about your fan if you fancy that.
Airhead
They don't sound like completely unreasonable comments. Not sure about the humidistat, maybe he missed that it's there? Would have thought it was reasonable to have it connected that way. Is the dishwasher switch labelled? The hallway does seem reasonable really, probably cheaper to fit a wireless switch than hard wire it retrospectively.