PaulUK:
I am not sure if this is related to this or not. anyway here it goes most older style bathroom did have a repectaile with the lumiaire but to run seprated like currentally now i think they start doing that i think in mid 70's when it got widespread at the same time the bathroom get little larger along the way.
Paul i am sure your UK system still not allow the repectale in the bathroom unless it have RCD or isolated transformer for it if i am right?? [ I know the French verison so i will shoot it in a min ]
In France we have a repectale but it on RCD but not too widespred useage yet but slowly catchup with it.
I will leave that final answer with Allen Benson in France to find the final code with that.
Merci , Marc