Thanks for the comments guys. I've been looking into some dew control. I started looking at designs for home made heaters but then though I should do something more basic like get a shroud first.
As a quick and dirty I am waiting to try out a camping mat wrapped around. As it is stored rolled up it has a natural curl and holds iteslf on. Not sure how effective this will be, but if it works could be a cheap option to cut one to fit properly.
I was out today hunting for a 12v hair dryer but can't find any.
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