Nothing about churchyards in the Exceptions Guide!!Client said they are exempt from having a condensing boiler as the building backs onto the Church yard.
It is an exemptions GUIDE for standard situations.
If you know all the legislation like the back of your hand, you can install whatever you want anyway; plenty of loopholes.
You can't even double glaze the existing window frames in fully listed building, let alone drill a hole in the wall to fit a steaming plastic pipe.
Forget the graveyard, nobody there will complain, it is the listing issue that is important