My Mum phoned me last night to say her cold water tap wasn't working in her kitchen. Went this morning, all other taps in house were fine so stripped the tap down and the only way I could get the tap to work was to loosen the valve nut inside the tap. This did the trick but when you turn on the water some leaks out of the tap base. Could the problem be that we need a new valve. When I tighten the valve up with the spanner to where I presume it should be, that is tight and replace the tap knob, no water comes out and it doesn't seem to be catching so really stiff and no water. Please help I'm just a woman!