I've been handed a card by the National Grid stating that the earth bonding on my gas pipe does not comply with regs. It seems that where the bonding clamp is attached to the gas pipe, and connected to earth on my consumer unit, is too far from the gas meter. The bonding clamp, apparently, should be on the gas pipe no further than 600mm from the meter.
I'm a bit puzzled by this. Why should it make a difference if the earth bonding clamp is attached to the gas pipe close to the meter - or (in my case) about ten feet away? Surely, as long as the earth bonding clamp is clamped onto the pipe it shouldn't matter how far it is from the meter - the earthing continuity is there through the pipe.
There's no real problem - I'm just going to have to move the clamp and buy about 15 feet of earthing cable - but I'm puzzled as to why it should be necessary to do this.