Haha! Good questions. We've not moved in yet so we don't know about energy use. We'll move in in the summer and looking to do some work before then. Course, that means some decisions will either need to be delayed, or based on obvious gains (if there are such things!). There's currently an LPG combi boiler for hot water and heating (no mains gas), plus electricity for other services.
It's a brick-built terraced house, with cavity walls at both ends which are currently not insulated. So we plan to get that done. There is also one solid wall, which runs down one side at ground floor level – that's the "side entry" passageway that runs through the terrace, giving access to the back garden. This wall is *really* cold, but not damp and not exposed to sun or rain because it's covered by the upper storey. The fairly narrow passageway means it can't be insulated outside so I'm thinking IWI, but also thinking that might wait until we've been in a while. Internally, that wall is mostly hallway so we can't have too much extra bulk on the wall.
The house has a fully south-facing roof with no shade (on the edge of a village) so seems a gimme for solar of some sort.
Good question about the weather. It's SW England (Somerset), so generally warm and wet. But I will see what more detail I can find. No flood risk, though, according the the Environment Agency (and neighbours).
Thanks for getting back to me.