The two door policy was abandoned a few years ago (more's the shame).
Condensation can really only be tackled with improved heating and ventilation. Heat raises the temperature of the walls so condensation is reduced, and forced ventilation removes the moist air and hopefully replaces it with dry air.
I deal with this stuff on a regular basis in a professional capacity carrying out reports in connection with the Homes (Fitness for Human Habitation) Act 2018.
In reality, in a toilet, the more important of the two is heat. If it was a shower room, then ventilation (extraction) would be more important (but I would want both). The tube heater idea is probably the simplest solution and as they are only 60W, using an extension lead on a temporary basis, should make things a let better.
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