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If you managed to exclude drafts and used high U value windows along with a concrete thermal mass floor with underfloor heating, would that lessen the need for a lot of insulation? I would have thought that with the thick set walls you are already retaining a lot of the heat. Then adde some heat exchangers to keep the airflow normal? You can get very simple vent axia ones that are cheap and can be programmed on a temperature or humidity setting.
We recently used lime plaster as per the hertige officers stipulation. It was a complete disaster and we had to pay to get a pro in to do it properly. I would avoid it like the plague based on personal experience.
SimonM
@Sam_w
One last post for now...
Internal walls: We are trying to avoid plasterboard and skim for two main reasons, first it isn't very breathable and second I can't do it myself.
That leaves us with two options, we go a traditional route like lime plaster (not sure I can do this either!) or we use something like fermacell which doesn't need skimming. Negatives seem to be cost, which is partially negated by not needing to employ a plasterer to skim, and also the weight, a standard board weighs 35kg!
Benefits are that it is breathable, can be done DIY, and is a much stronger wall than pb, one screw can support 25kg apparently, so great for hanging things off.