Hi Guy/Nigel
I suspect Pilkington are probably now around £500 for the screens, my last one took over 6 months as they are special order on Finland from memory. So a U.K. manufacturer would be useful and if you can cover the tooling over a few then it may make sense. As to heated screen, not sure how many folk would make that much use of it given main use tends to be warmer months, but if the premium is not that much, maybe worth considering. Either way I would think the tooling would do both?
Given the number of brown edged screens I have seen, there must be a few folk who would go for a reasonably priced one.
Peter