afraid i dont have a manual for the shower (previous owners failed to leave it behind). i would suggest calling Bristan customer services - they are generally pretty helpful.
fyg - Bristan currently offer a service whereby it is cheaper to buy a replacement cartridge and have one of their...
Thanks, after a few more attempts i managed to budge the thing (build up of limescale on the thread to blame as you predicted).
I am now struggling to remove the actual cartridge - previous owners of our flat weren't the best when it came to general upkeep of things so no doubt this...
i am going through the same process of trying to change the seals in exactly the same model of Bristan 1901 shower. however, i am struggling to remove the chrome ring that holds in the ceramic cap. anyone got any tips? is it screwed on or clipped on? does it screw on clockwise or anticlockwise...