I am currently running a new circuit to an outbuilding in SWA. Incoming supply to property is TNCS and I was going to TT the outbuilding. The property has oil fired heating and the feed pipe inside is bonded at the boiler to the TNCS system, I was going to bond the oil tank/outlet pipe in the outbuilding to my TT system but I am now beginiing to think I should just leave it connected at the house end, any thoughts?