Thanks for the tips there Eric and Alexander, I thought I may have to think about some heater's at some point. The idea of the hair drier sounds tempting to start with though.
There are so many exciting accessories I'd rather spend my money on such as Naglers, panoptics, UHC filters, maybe even a skywatcher 80mmED grab and go rather than heaters
But of course, none of those are much point if whenever I set up everything fogs over, and where I live is a very wet place for a lot of the year
Regards
Ant