Hi again, that should be the way it is done,once you have decided what sort of towel rail etc you want, get the plumber to look at where you want it to go,he will advise you as to wether it is possible, then tiles etc can be removed,the plumber does his work, you retile, the plumber comes back and connects, bingo, if you are doing the underfloor heating, that can also be done after the plumber has put pipes in, then have the floor tiled,before the wall tiles,hope this makes sense. good luck, Ray