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provr6
Wood burning stove with a thermal store would be a good option, you would not really heat directly to the radiators, this is quite a cost effective option, however, you do become a slave to the stove so it is good to install other options. If you have roof space you could add solar water heating.
Glad you are addressing the insulation, the gap between the bricks on victorian houses are not that wide and problems can occur, using a vapour barrier with insulated plasterboard in the internal walls may be an option but disruptive.
I do like the idea of the thermal store as I could use a wooderburner and electric element as back up to heat it. The Solar thermal panel would also be good but I have taken up all my main roof space with PV Panels. I do have an outbuilding I could use about 3m from the house.
The cost would probably start racking up. Would a single solar thermal panel be suitable for a small 3 bed semi cottage? I take it EPC's don't apply to solar thermal.
Food for thought.