Hi,
I've got a shower/bath mixer tap that's leaking and has been getting worse over the last 6 months or so.

Could someone please help me out with a couple of Q's before I attempt to fix it. I live in a block of flats and turning the water off involves turning the whole blocks supply off... so I want to get all my materials together before I start the job.

Here's the tap:


It's the top level that controls the bath or shower on/off that's the problem I think.

1. What kind of seating can I expect to find in there? i.e ceramic or plastic?

2. What kind of washers I am likely to need? O-ring ones...?

3. If I end up having to replace the whole valve seating (it leaks quite badly now) what sort of price am I looking at?

Any help and tips would be greatly appreciated thanks!

Update...

Does anyone know what kind of valve will be in this tap?
It's the top one that turns the bath on (if turned to the left) or the shower on (if turned to the right)?
The bottom tap is temperature.

Will the ceramic disk/valve be different to a normal valve on a standard tap... like some sort of diverter valve?

I've lived here 8 years.
None on the flats have individual stopcocks.