when I turn off the interior stop cock the hot water taps dont run any water when open. However, all cold water taps run as normal with no visible change in pressure......help, my old bathroom is out and I need to run a new cold & hot water pipe b4 i can put the new 1 in......the wife is goin nutz!!! ohyeah, the outside stop appears to have been tarmacced over by NTL! Is there a way of replacing the inside stop while the feed is still live (or would that just flood the kitchen and make the wife kneecap me?!!)?