I would get a fan heater and blow warm air into the bathroom from the landing when the door is open.
Even drag it into the bathroom occasionally if the lead will fit under the door.
The paranoia about electric items in bathrooms is ridiculous. Other countries have sockets and wall switches in there.
Just use common sense.
I’d buy one or two electric oil filled radiators (if that’s what they’re still called) and plug the bathroom one into a socket outside the bathroom, shut the bathroom door and the room will soon heat up.
On our recent road trip around norther Europe, all the hotels we stayed in, in the various countries, had normal electric sockets in the bathrooms.
I remember those heaters, dave. I don't know if the one I used to have was unusual but it didn't heat the room, you couldn't feel it unless you was stood right under it. Glowed a very bright red.
The Germans think it is odd that we often have our washing machine in the kitchen. They usually have theirs in the bathroom.
Much more logical, it's the washing room.
So do Mediterranean countries. The first time I saw a washing machine in the bathroom it freaked me out.
Whereas American homes often have a laundry room...or machines are in the basement in older houses.
Sorry for digressing!
Washing machine in bathroom just telling you that if the electric supply is a good one and meets all safety standards you can plug electric heater etc into a bathroom plug
//Washing machine in bathroom just telling you that if the electric supply is a good one and meets all safety standards you can plug electric heater etc into a bathroom plug//
I disagree - if you plug a portable heater into 250v supply and have it in the bathroom (whether or not the plug is outside) it constitutes a danger & there are specific areas of the bathroom it should not be able to reach.
My oil filled radiator on the lowest setting puts out plenty of heat. I found it to be cheap to run. I don't use it now as I have underfloor heating, just keep it for an emergency.