Thanks for the imput, fogging is already as issue and yep I'm driving with the windows open and an old pillow case to wipe the glass over every now and again!
I did a quick google and got this on the first return page
http://www.gbdriver.co.uk/acatalog/Online_Catalogue_fan_47.html
Sounds like the biz to me!
I wonder will the fuse take the strain of 15 amps
Mike.