Originally Posted by Mr_love_monkey

Stopcock is half a metre away from where that picture was taken.

As I say, it was a leaking stopcock, which has been replaced.

It is accessible, through the cupboard, and I had a feel and it was wet, but so was most of the piping back there.

Basically the stopcock had leaked soaked the walls and so on.

As I said, I already knew it was a leak from somewhere, I just wanted the builder to admit it and replace it, which he did - whether he admits it was his fault, I don't care too much, but the fact he did it for free speaks volumes.