On Mon, 11 Dec 2017 18:00:33 +0000, 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.

Only 1kW? Try
http://lh4.ggpht.com/_hVOW2U7K4-M/Sn...8/s640/133.jpg
Cleans the windows, heats the cab and clears the drive.