I wonder if anyone can help - there appears to be a "slow" leak from my cold mains pipe, I have tried to locate the stopcock but cant find it anywhere. i've looked under teh sink, behind the washing machine, under the stairs etc. In the airing cupboard there are two brass taps - one of which turned down the water pressure - is this the stopcock or is it the gate valve? Any help would be greatly appreciated. I live in a purpose built maisonette and have asked my neighbour who says hers is under her sink. I am at a complete loss. Help!!!