The (fairly standard looking) tap in question is for the hot water in the bathroom basin - must be about 20 years old. For a long time it's only delivered water at a moderate rate when fully on, but now it only comes out at a trickle, seem like when I turn it on it's not going all the way up so the flow is restricted.
Would a duff washer cause this?
All other taps in the house deliver the water just fine, ie it's not a general hot water flow problem, it's just this tap.
Thanks