This summer I need to have my upstairs bathroom refurbished. It was installed 12 yeas ago by the previous house owner, who also did the self-build addition of an upper storey to the previous bungalow. The bathroom has lots of lovely features including electric ufh, and a long crack all the way down a row of tiles.   I think the room pretty much needs gutting, as the problem is probably under the floor, which is a huge pity because the fittings are so pleasant. I think, however, that I