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When I open the stopcock for my mains water supply the stopcock body leaks but if I try to tighten the nut on the body it restricts the efficiency of the stopcock and the capacity to open and close it. What can I do.

I have a radiator that I wanted to adjust a little so I tried to open the valve but it offers no resitance and continues to turn indefinately having no effect, it is only the first time I have had to touch the valve in the 18 months since my c.h.system was fitted. The valve is one of the new...