It also had the un-metered water rising main. There was no gas.
One bonding conductor from the water to the MET, and three earth conductors, one from each CU to the MET.
Running a separate bonding conductor to pick up the water again as it entered each flat would have been a waste.
Then again, an upstairs flat I'm working in at the moment, has a CU behind the front door on the ground floor, with a gas meter on the opposite side of hall above the height of the door. Nice and easy to run the bonding.
Unfortunately, the water is in the middle of the flat on the other side of the property. A run under the floor boards of about 18m.
As the owner doesn't want any floorbords and carpet lifting, there are two options, one is to run the bonding conductor from th CU to the gas, then out through the wall, along the wall untill oposite the water and hope that there is a clear path under the floorboards to the water.
Unlikely, as there appears to be two brick walls in the way, which are most likely supported by joists.
The other option, is to run up the outside of the wall to the loft, across the loft, down into an old airing cupboard and then alongside some boxed in water pipes to the rising main, about 30m.
