Yes it made me laugh aswell unfortunately not for whoever
got the bill for "extra supplementary bonding"
It seems a popular extra for the cowboys out there here's another :D
Yes that's fine if it's just a toilet in the room as you say, one maybe
two downlights will do I guess they would get the same lights in the bathroom to match
if its been fine for a while it's probably just old and some scale so better to get a new one in there anyway try for a silent fill one if you can get hold of 1 hopefully that sort the noise
is it mains fed because some mains pressure ones are quite loud sometimes. maybe you could get a silent fill side entry valve that has a bit of plastic wrapping to suppress the sound of water filling up