>> It has no heating and no extractor. It's sort of off the kitchen.
>>
Does the kitchen have an extractor? That and the downstairs loo may be where some of the moisture is coming from and the loo should have an extractor if the extension was being built today.
Other suggestions to do with heat and ventilation absolutely valid.
IMO you shouldn't worry about adding another radiator in a terrace house even if the flow ends up a bit convoluted; a good plumber will be able to balance it with the rest of the house after fitting. We have mercilessly messed around with the plumbing over the last 20 years. One can always turn the pump up or fit a more beefy one to get the water flowing well
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