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tc
Howard
Howard's reply covers it well. A kitchen extension has probably blocked off the original airbricks, especially if it's a concrete floor butting up against the original footprint's timber floor.
We've just had the same thing, basically no air bricks, as a single front one was blocked, and the rears had been covered by a kitchen extension before our time, and the sub-floor was indeed rotten, and we now wish we'd pushed for a proper floor survey - vendor said no to an invasive survey, which is kind of understandable but perhaps should have raised more alarms.
If possible I'd try and find out more about the state of the floor, either with a full floor/damp survey (although you could argue that damp specialists will always find damp...not always the case but...) or at least a visit to the house with someone experienced in timber floors.
Message me if you want more details.