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Other than an obvious point at which heat escapes from the place, what the future issues I need to avoid? The fireplaces are still present and we will keep them (or at some point in the future remove the breast completely). But I wouldn't be surprised if there's some kind impending disaster if fireplaces remain unused for long periods of time that I'm unaware of.
Howard
Currid
Some classic advice from a bloke off the internet there. "Kicking it down the road" perhaps not the best thing to do if you own the place.
If you would like to try and avoid future issues I'd suggest you cap and vent. A hit & miss vent can be used to reduce draft/heat loss a bit when particularly cold.