Thanks Dave, I'll go with that and get the guy back to plumb the cold
mains into the bathroom. The cold mains pressure seems quite
reasonable; and the combi works fine when the cold mains-fed kitchen
tap is wide open.

Matt

"David W.E. Roberts" wrote in message ...
Only problem is if the mains pressure is so low that it is below spec. for
the combi when a mains cold tap anywhere in the flat is turned on. You do
have mains cold in at least the kitchen, don't you, for drinking water? Not
a good idea to drink water from a storage tank! Think dead mouse.

Only other thing I can think of at the moment is to install your own cold
water storage tank, plus a booster pump, to give your own dedicated tank fed
(boosted) cold supply to the shower. However this seems like overkill.

HTH
Dave R