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thanks for the responses. I did think of opening it up to see inside. Have got it going first time by tapping it gently, but when next used stuck again. I think I will have to fit a good isolation valve and strip it down if possible. Its no good as it is and wont be buying another gainsborough...

I have a gainsborough shower or my dad does anyway. recently it started not stoping on the water flow when switched off. Inside there appears to be a valve that switches off a main valve after a few seconds. I also noticed inside the case stuck to it what appears to be some washers three white...