Bill Wright wrote:

It works rather well. I have the fire on the lowest setting (1kW) and
leave it on a board on the seat for 20 minutes. It's worth the fourpence.

Having had a couple of early/cold morning starts, I was thinking of
popping the fan heater from the garage in the car, ready to switch on in
the mornings, but not sure whether the door seals would take a cable
thick enough for a heater, or I'd end up with a chopped extension and a
live car :-)