open it while is off the boiler, put it back on and turn the mains back on and close the valve when its up to pressure. that will get you refilled until you get a new tap.
Aye sorry mate you were bang on. Turned the water off, took the valve off and sure enough the end of the plastic valve was jammed in blocking the supply. Got it filled by using the main water valve then closing the filler tap at 1 bar- so we have heat and water til i can get a replacement tap.Thanks very much for taking the time mate
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