I can finally put you all, and myself, out of out collective misery.

It's a Ford. Well, it's based on a Ford anyway - a based on a Ford Taunus 20m TS.

It is an OSI 20m TS to be exact.

http://www.taunus.nl/OSI/eng/eng.htm
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...