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That should give me some kind of starting point.
Unless something else is very very wrong with your gaff, the bulk of the heat loss will come from the single skin uninsulated end of terrace wall. If you can insulate that externally, most of the job would be done. At the moment, it acts as a giant heatsink / cold bridge for your entire house.
Howard
@aggi
Cheers all. That should give me some kind of starting point.