Thanks to everyone for the replies. Have now located the blockage which was located inside the flexi hose up to the tap. Sure enough it was a peice of foam from the cylinder! Luckily it had caught in the 'narrowing' of the flexi.
Replaced the flexi hose with a straight through copper pipe and all is great. (It has even improved the flow from the tap as the flexi was restricting the water flow) Again all replies were greatly appreciated. Martin
Replaced the flexi hose with a straight through copper pipe and all is great. (It has even improved the flow from the tap as the flexi was restricting the water flow) Again all replies were greatly appreciated. Martin