Look: A gasifier run ice.
It makes me miss living in Bristol where I had friends nearby who would probably have been entertained and helpful in the process of building such a thing. Clearly UK legislation would make building one of these in a car somewhat difficult (ironically since WWII shots show vehicles with gasifiers pootling around the UK). Clearly a van would be a better basis for producing one, although you’d have to isolate it from the passenger cab.
Anyhow, work calls.