How can I fix my hot water tap?

The wash-basin hot water tap, in the bathroom only, has reduced in flow to a drip. It is fed from an immersion heater, the bath-tap and kitchen hot water tap both have normal flow. What do I do?
Gary Evans, November 2004


done
it is gravity fed form your tank ckeack for blocks or air locks link hot and cold turn on both may clear

eamon, January 2005