A while ago,the water board uprated the mains water supply pipes in our area. And as a result we enjoyed more water pressure (great for the hosepipe)..But this has led to the problem of water hammer when i turn my Mira 415 shower to certain positions...it doesn't happen with any other tap in the house...So is it a problem with the shower mixer ? if so can it be repaired ? or should i fit either a pressure reducing valve (and where)..or one of those blank ended copper pipe thingys? (again where)....the hammer is very bad depending on where the shower control is positioned and i'm worried it may damage something....Thanks in advance...Bill