I decided to take the water company at their word and changed the pipe from my stopcock back to the convenient splice where they'd spliced it. I found their philmac couplers (2, back to back..imperial to metric back to imperial). The pipe I pulled up is perfect..unless its pinholed...but would a pinhole so close to my wall leak £700 quid's worth without me noticing?
That sounds like a typical pipe repair splicing in a short length of new pipe to replace the leaking piece.
What all seems very odd to me is that the meter is wizzing round, people come from the Water Company, the meter stopped turning and no one admits there was any leak! Then they refund you the cost of invoiced water.
Usually when pipes have been dug up or dug down to there is significant evidence left on the surface!
This seems a very unusual story with a lot of non sequiturs!
Tony