You do have to obey the regulations in this area
Also deal with the condensation.
An extractor might be mandatory.
Yep, talked through the regs with the electrician. He will run a cable outside and through the wall.
I already have an extractor fan fitted.
I thank everyone** for their help. I have decided on a Dimple 3 KW wall mounted heater.
** apart from @oldwheels who has caused me to have nightmares
