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Thanks everyone. So I take it that the hit water and central heating don't need "bonding". Combi is in kitchen.

Thank you. I have a main earth coming in from the electricity provider. This goes to a terminal block. From this terminal block, an earth goes to the consumer unit, and also a separate earth goes first to the gas pipe and continues (unbroken) to the incoming water supply. It basically looks like...

My consumer unit is split and has two RCD's protecting all the circuits. The main earthing is a single cable from the main earthing terminal connecting the gas and incoming cold water. I have a combi boiler, but I cannot see the any hot water pipe earthed. Is that normal?