No pendants in the bathroom eh? Back to the drawing board.
I think I'll just buy a new extractor fan and be done with it. I'll just swap one for the other. And buy a new light fitting!
Thanks for the information everyone :)
I am presently revamping the entire bathroom. This includes putting in a new tongue & groove ceiling. The existing shower pull switch will remain and I'm going to take down the current light and replace it with a plain pendant fitting. No real problems there, that seems straightforward enough...