Loft insulation is between ceiling and roof space. I assume you have the recommended amount? Your mention of slate/felt is about the roof construction.
Sounds like you have mostly single glazed. Our old house was the same. And it had a lot of nice original leaded windows.
Combi boilers we are finding are really useful - always have hot water. If you make sure the condensate pipes won''t freeze there is no problem. We had no problem this previous winter. When we had the boiler serviced we were told the one we have is one of the reliable ones - thankfully.
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