in the end i put it down as an AR, because it has no sleeve i was able to. However as wrong as it seems if it was sleeved i couldnt think of any reason to AR it.
it was in a hospital/old peoples home, so IDing it was to be avoided for as long as possible, but there was also no high ventilation or extraction (although not effecting combustion), they were using the plant room for storage and half the plant room was full of combustable looking rails of clothes. no earth bonding with electrical flex attached to every bit of gas pipe i could see
rough choices, who'd have thought box ticking would be so hard, life aint easy for a gas man