Digging around, I came across the attached.

http://www.heatedwindscreen.com/acatalog/heated-windscreens.html

Note the price of a Land Rover 90 heated screen which is similar to a Morgan in that it appears to be a piece of flat glass. With a Morgan screen costing £840 plus fitting, it makes you wonder......
Please note that I have no connection whatsoever with the company shown.
Don.