Andy Dingley wrote:
On Sun, 24 Oct 2004 15:30:35 +0100, "JM" wrote:

Yes - the leaking occurs whether the hoses are connected or not, and whether
the taps are on or off.

The leakage appears to be both from the joint between the pipe and the
valve, and from the end of the valve (i.e.after the tap).

If it's leaking before the valve, then that's a bad compression
fitting. It can be caused by the pipe being poorly cut (and
distorted), re-using an old olive, jointing onto painted pipe, or just
being cack-handed at fitting them.

The fix is to take the valve off and re-fit it, doing it carefully
this time. You'll need a new olive.

The valve shouldn't leak internally, but especially for high pressure
cold water, it wouldnt be the first one to do so.

http://www.screwfix.com/
http://www.toolstation.com/

I believe toolstation are still doing free delivery, so that might be
the best way - simply order two valves free postage, should come to
only a couple of quid.