Whilst re-fitting my bathroom, i am planning to replace the existing rad with a chrome heated towel rail. This will be located a lot higher than the original rad an therefore the pipework will need extending. In order to make it look like a neat job i was hoping to hide the pipes within the wall and bring out to connect to the rail higher up - is this an acceptable thing to do? Am I missing any vital points or is it a fairly simple replacement and pipe extension type job?