Hi guys, firstly, the light in question had actually been working, but stopped a couple of weeks ago, also, it was not attached to a fan. So anyway I went there today, took the cover down and there were two sets of twins &earth going into it. Looking into the ceiling, one twin & earth cable was going one way and the other was going in the opposite direction- towards another light outside of the bathroom, that had "not been working for years". There was obviously an issue there and as a handyman not a tradesman, I put the cover back, gave my Uncle the number of a local spark and left it at that. If would have been a single twin&earth going into it I would have noted the wiring and replaced like for like.