Door swelling and sticking

No. A tumble dryer. It has a vent at the back and is only used with the door open

Do you mean that you have a vented drier, without a hose going outside the building, that you use indoors?
 
In a perfect world the door would be treated before hanging but it all depends on the finish you want to see at the end: a natural look wouldn't need a stain, and clear gloss/matt varnish would maintain the natural appearance of the door.
I usually use Ronseal: it always does exactly what it says on the tin.
Until then, don't take any more off your door, allow it to dry out and around the equinox you should be able to enjoy a day in the spring air to do the job.

Would this do it? I don't want to change the colour, just preserve it and make it look a bit less weather worn. 2.5l seems excessive?

https://www.wickes.co.uk/Ronseal-Yacht-Varnish---Clear-Satin-2-5L/p/174248
 
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