I am looking for a supple of 12v dc bottle heaters. There is a link below for the product NOS uses, but I'm sure there is a cheaper way of doing this.
It is basically a pvc/rubber mat the wraps round the bottle and heats to 85c.
Thanks ....

http://www.nosnitrous.com/HiOctn/ProdLine/Products/NOS/bottleacc1.html

someone must have seen these somewhere ...

This may sound daft Nigel, but have you tried any camping shops?

I was wondering if there was something similar in use for tent / sleeping bag warming :D

Well you'll never know unless you ask....

Highjack a dominos pizza bike and get the topbox!!

seriously (sp?) what do the pizza cars/bikes use to keep pizza warm??

Already found that pet store do one to cook a cat with, sorry, warm!
It's 240v ac though ... thanks for the ideas so far.