Spotted this whilst looking for parts for mine, it clearly has the engine and gearbox of a military m20 but it's been pretty messed around with in other areas!

http://www.carandclassic.co.uk/car/C837201

http://www.carandclassic.co.uk/uploads/cars/bsa/8388294.jpg

email (option): packagingmuseum@gmail.com

That is definitely one of the rare export models, still with its original 'Riviera' handlebars and Duo Glide frame, wow what a find