ok the taps are ordinary twist taps, nothing fancy, we replaced like with like, the hot water is comming from the cylinder in hot press, the cold is mains. The sink next to the bath is fine the pressure is normal, it just seems to be the hot tap in the bath! Thanks for helping!
I fitted new mixer tap to the bath - it is exactly the same as the one that was origianly there. I thought all was ok but now the hot water is only a trickle but the cold water is fine - anyone got any ideas?