Googled for heated clothing and found this emporia based in Lancashire.
http://www.betterlifehealthcare.com/products.php?catID=1&subID=375&gclid=CMyOx7CMspACFRGCGgodZxvDMA
As you can see they do a range of heated clothing; one of the waistcoats comes with a 12v DC connection for car/motorbike and is only £32.68p.
http://www.betterlifehealthcare.com/products.php?catID=1&subID=375&gclid=CMyOx7CMspACFRGCGgodZxvDMA
As you can see they do a range of heated clothing; one of the waistcoats comes with a 12v DC connection for car/motorbike and is only £32.68p.

