Thanks. I was going to put a switch in the airing cupboard, so no chance of wet fingers touching it. In the bathroom I was going to use a fused spur (with no switch) but just wasn't sure if the little "flap" over the fuse was a problem with regard to water ingress, but like you say, it's going to be sensibly away from the shower head so it should be fine. If the switch is fused then I could, like you say, just use a connector plate in the bathroom to be doubly sure. I would quite like something with a neon though, so that I remember to turn them off!
Thanks again.