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Possibly.Incidentally there is a very old earthing connector with the frayed remnants of a cable attached to it on a water pipe near to the CU so my guess is that sometime in this house's 100 year history the water pipes were the earth.
The other explanation could be that the GPO attached a wire to the water pipe to use as an earth for the telephone line. Back in the day, it was used for a shared service or for lightning protection.
Probably not the first time that BS documents are not in agreement.You could, if you wanted, use the water pipe - or other metal parts except gas pipes - as part of the bonding conductor itself which makes a mockery of the claims that it must be a continuous cable.