It's not an either / or.
If it's cold it needs heating.
If it's damp it needs ventilation.
Adding a radiator is not necessarily so easy, it's not like tapping in an electrical spur. One has to consider how the entire circuit(s) flows.
If it is small and insulated, perhaps an electrically heated towel rail would be sufficient?
Still need to put a fan in though, especially as it's a toilet.
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