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dsl
The convertible was an early Reliant Regal, I think. It was a threewheeler.
I think it could be a 1965+ Bond Minicar Mark G 250 Tourer. http://bondcars.net/Minicar20G.htm , http://imcdb.org/vehicle_258218-Bond-Minicar-Mark-G-1965.html .
You could probably create something similar on your Reliant by 15 minutes work with a nail-file and some black bin bags ...