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Pretty much exactly what our surveyor said to us. C18th stone terrace with partial flagstone floor laid directly on earth, inadequate underfloor ventilation and high ground levels outside = damp floor (and to a lesser extent, walls). He did say that lifting the flags and lining underneath was an option but would most likely drive the moisture into the walls. His recommendations were to sort the ventilation (currently has vents only at one side of the house), use the wood stove and keep the heating on.
hiraethus-
Sounds good advice.
I grew up in a house with pretty similar construction (solid stone walls, quarry tiles just laid on earth etc). Adding a (supposedly) 'breathable' limecrete floor with underfloor heating and proper ventilation has transformed it, it's now actually warm and the condensation is a lot better.
Vanneau
Absolutely. 'Rising damp' and the traditional ways of dealing with the problem (injected DPC) need to be consigned to the bin.
You often get damp at the bottom of walls in old houses but you'll generally find poor drainage, blocked air bricks or raised ground levels are a contributing factor and once these are addressed things will dry out a bit. A lot of 'rising damp' is just the result of rainwater splashing back up off poorly drained / raised hardstanding. I've seen pictures of a beautiful bit of early 18th century brickwork which had been affected by this, and some clown had drilled a huge line of holes across it and injected a DPC (which did nothing).
Old houses will get damp because their builders did not envisage cement renders, double glazing, and having radiators with a load of clothes drying on them rather than a lot of nice open fires pulling air through the building. Address that and they can perform pretty well.