JoeB:Yes sorry I should have been more clear, the incoming pipe is metal up to the stopcock and then it vanishes into the wall where it turns to plastic to supply the kitchen and bathroom.
Are you sure, as that sounds unlikely. In a flat of that age I would generally expect blue plastic water supply pipes into the flat?
If the supply pipe into the flat is metal then I would expect main protective bonding may be in place where the supplies come into the building.
JoeB:Yes sorry I should have been more clear, the incoming pipe is metal up to the stopcock and then it vanishes into the wall where it turns to plastic to supply the kitchen and bathroom.
Are you sure, as that sounds unlikely. In a flat of that age I would generally expect blue plastic water supply pipes into the flat?
If the supply pipe into the flat is metal then I would expect main protective bonding may be in place where the supplies come into the building.
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