hi guys,I need to change my kitchen tap,I can turn off cold water at main but how to turn off hot water ? In my airing cupboard I have the usual big copper tank,in the loft I have 2 big plastic tanks and a smaller header tank,luckily when the plumbers installed the plumbing and central heating pipe work they added info tags to the red gate valves ,now my question is......one of the tags is on the gate valve on a thick pipe (22mm) coming down from the loft ,on the tag it says "Main cold feed will turn off all hot water to the house" now if I turn off that gate valve and run the hot tap will it /should it eventually stop the hot water coming out of kitchen tap ? Enabling me then to disconnect the old tap and fit a new one?....also will my airing cupboard copper tank get empty of the hot water currently in there....hope you understand my questions...many thanks in advance.