[daxx]

Are there any taps in the kithchen which are fed direct from the mains? Is so to rule out a leak attach a bit of transparent *ish) plastic pipe to the tap, turn off the exterior feed stop c o c k, turn on the tap that your bit of plastic pipe is attached to, you'll get a bit of water coming out as the bit from the 'above you pipework' empties, then carefully watch the level in the plassy tube, if needs be mark the pipe and go away and play on the puter and check it later. If the levels dropped you've got a leak