The washers need renewing on the bath taps & I can find no way to isolate the taps without draining the water tank. I've checked under the bath & sink with no luck. Is there any way I can isolate the taps as I don't really want to waste the water. I seem to remember when a BG engineer renewed a leaking radiator valve he told me he was able create, now bear with me if I'm wrong!, an air lock?, that enabled him to replace the valve without draining the radiator or tank. Is this possioble for a tap?
Any suggestions would be appreciated.