Can anyone please help me to find a spare part for my shower taps. There is nothing wrong with the taps but between the them is a handle that diverts water through a flexible shower head hose. Behind this handle and, inside the tap housing, is a plastic "valve" which holds the handle in place and diverts the water through the hose. This valve has broken into 2 parts making the hose useless. Any help or advice will be very gratefully received. Thanks for your time. John.