BTW Dave,
I think I must have mis-understood you, in your post about the Isolating Transformer and the RCD.
We have plates here that have both for bathrooms in hotels.
As in a Shaver socket, that would be the Isolating Tranny and anything else would be fed via the RCD.
However, I'm interested to know if a Selective Type RCD would be used up-stream of the 30mA unit in the bathroom?.
Type S being 100mA?.
I know that Aussie uses them, and we should do, but what is common in Ireland and the UK?.