My B&Q Victorian style Bath/Shower mixer is not running hot water. We have a combi boiler. This problem has happened before and fixed itself, which made me think it was an airlock problem. I've followed the instructions for airlocks with a sponge, and it hasn't made a difference this time. The hot tap itself doesn't seem to turn more than one rotation at the moment either. There is occasionally a trickle of water on half open, which stops after 30 seconds or so. There is also quite a lot of noise. Cold water is fine, all other taps in the house are fine. What can I try next please? I discovered this last night after dyeing my hair, which was a bit of a problem to rinse! We have no other bath or shower so I need to fix it! Please help!