Couple of threads that might be of interest. http://www.eastdulwichforum.co.uk/forum/read.php?29,1189509,1191148#msg-1191148 http://www.eastdulwichforum.co.uk/forum/read.php?30,1149042,1188990#msg-1188990 As for noise this can largely be eliminated by using a Fluidmaster valve, or similar, rather than a traditional ballcock type. They are designed to be much quieter than traditional valves.