Discuss Voltage in shower waste! in the UK Electrical Forum area at ElectriciansForums.net
If the voltage is absent with some circuits off, and remains absent even when there is load on other circuits, and the Ze is OK, that would suggest a localised insulation fault rather than external. If the insulation has broken down to some pipework or structural metal that is not bonded your original IR test might not have revealed it. How about earthing the water flow and repeating the IR test on suspect circuits.
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