This seems like a silly question.
House with a traditional cold roof, and the boiler in the roof.
Is a CO detector needed, and if so where?
I think the answers are probably no and nowhere. But it is a rented house and fitting one is "best practice" (not "required"), so obv I normally fit one near the boiler.
In this case I think I will not fit one as CO rises.
Can anyone see any problems?