Bramham Mixer Valve
A strip down clean lube and fitting a service kit will solvemost problems with this valve
http://www.showerdoc.com/sirrus-valve-service-kit-sk1500-1
However from your ticket I wonder if your problem may bewith your pump rather than your shower valve.
Can you get hold of the hot supply pipe going to your showeris it hot?
Answered 11 years ago by The Shower Doctor
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Sirrus Bramham Shower Spares
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