Hmm... I've just realised that it's LHD, so I think that rules out a Vauxhall. Maybe some sort of an OPEL?
This 2 door body was also sold in Australia as the Holden Gemini, but were originally an Isuzu product. Apart from Holden, Vauxhall, Isuzu and Opel, maybe some other GM company used the same shell?