Hi Steveb. This is not the problem, there is already a second (working) stopcock above the floor. The problem is a slight leak which has gone unnoticed from the old cock below floor level and caused significant damp. Just need to cure weep at tap body/valve seal.
Thanks for the response. Can't replace the body without cutting old (sweated) body out from lead pipe and jointing lead incomer which has been cast into concrete floor (1960's extension). Pipe is not smooth and only short stub available without excavating concrete (& probably damaged). If I...
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