Thanks for all the replies on this thread. I'm now using a quick strap on my goggles, with the foam removed, anti fog spray and the gauze removed from the chin vent on my helmet. These simple changes have more or less stopped my glasses and goggles from fogging. I'm going to find out if the habervision extractor fan is available in the UK for next winter.
Keep the replies coming, hopefully others will find this thread to be a helpful reference
