I have leaking bath tap. It is a wall mounted style bath mixer. Being the modern tap I thought this would just be a case of replacing the ceramic disc, but no. A plumber says its the valves, but all the plumbers merchants do not stock these valves so the whole taps need replacing at a massive cost. He said he blew through the valves and could feel air. Does anyone no where I can buy these valves. (see pic). Should there be a ceramic disc inside, if so where? The pipes 15mm with 1/2" BSP. Thanks.
See Pic:
See Pic: