Danny you did your house up last year didn't you?
There shouldn't be any mould any how as you already said your doors are left open, you have central heating on all the time and let air move?
At moment I'm going into properties and thermal lining external walls (cold walls) because of no air movement,but every wall I'm doing I put a air vent in tenants don't like them and I'm sure as I leave there house there closing air vents off , so be it its not me living with mould , bathrooms and kitchens are always bad and most people think it's the house that's at fault, other faults drying clothing on radiators, dryers with no external vent there isn't much I haven't seen and the reasons, we could be having this discussion next year with twenty thousand plasterers and still no conclusion