In reply to all:
Thanks, some good ideas there, but still not sure about the styling of the jackets - want to try to keep away from something which is too Police looking and look more for a healthcare look (ie similar to those worn by the Ambulance crews and similar looking to the issue ones).
I did mean fluorescent, wasn't looking for a light emitting jacket sorry, poor choice of words there.
Neuromancer your experience sounds interesting with regards to the Keela?
I guess the issue is going to be a balance between being warm and waterproof and breathability.
I guess ideally what I was looking for would be something which was a cross between your typical outdoor breathable outer shell coat and the issue jackets in the fluorescent material and with the reflective strips plus the see through panels for the insertion of marking strips.