OK - if the shower is set to fully cold the flow is fast and if it is set to fully hot the flow is not much more than a dribble.
The temp on fully hot is not much more than lukewarm.
I have checked the flow and that seems fine. It is just that the water is freezing cold if the flow is full on and to get any hot water you have to turn the flow right down to not far from a dribble
Suddenly when we turn the dial on this shower to its normal position, about five o'clock, the water runs cold. The only way to get a lukewarm shower is to turn it to about 9 o'clock but then the water pressure is lessened. Has anybody got any ideas? I am capable of opening up the shower...