If you're going to gold plate anything, make it the water protection and structure of the floor, would definitely be my advice.Seeing this makes me want to pay a bit more for ditra when I do my DIY job.
Anyway tiling in the bathroom is moving along...albeit fairly slowly! Chap yesterday came at 9:30 then left at 2:15 as he'd 'laid the floor tiles so there was nothing else he can do today'. Possibly true, but it was a lovely sunny afternoon and the pub was no doubt beckoning .