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@Dammit
The metal pipes are not earthed, I've inspected them from consumer unit to where they all terminate, and unless they are connected to an earth inside the concrete they are cast into there is no earth bonding.
I could earth them to the outer of the mains feed, or the mains water pipe.
It is perfectly possible that they are no longer continuous within the concrete, I would have to run round the house (where possible) and check from CS termination to socket, which would involve some guesswork.