We have mixer taps in our bath. The cold tap was running very slowly and has gradually come to a halt with only a very small drip coming out. However, when we turn the stopcock off (thinking we might need to change the washer), this cold tap starts running, not quite at full pressure but certainly a steady stream. All of the other taps shut off correctly. We've left it running for quite a while in case it's draining a tank somewhere, but after 15 minutes it's still going.
Can anybody offer any advice please?
Can anybody offer any advice please?