On Thu, 20 Aug 2009 21:03:41 +0100, "Toby"
wrote:

Just turn the mains water to the property off, and then run a tap that is
fed from the tank, like the bath cold tap

Thanks. I was so focused on it being the hot water tap from the hot
water tank, I completely forgot that the bath cold tap came from the
tank (hopefully). Thanks again.