My sparkys queried whether a wallstar oil boiler requires equipotential bonding outside, considering the copper supply pipe from the tank connected to the non-return valve / fire valve then connects to a clear plastic hose before it goes to the pump/burner etc. The fire valve is held in place with a clamp connected to the boiler case, which I guess is also connected to a part of the case which is inside the home - so does it need cross-bonding outside???
Angus