[ppppenguin]

All this talk about earth bonding rather hides the main point of doing it. It isn't to earth things via the water and/or gas pipe. It's to ensure that all exposed metalwork in the house is at the same potential to minimise risk of shock if there's an insulation fault. Hence a house with plastic gas and water mains still needs bonding if the internal pipework is metal.

There's some professional disagreement about exactly what does and doesn't need earth bonding but that's not the point of this thread. If a mains earth works for you, then great. If it injects too much noise etc then you need a rod. Try it and see.