It's not the Jewitt Holden is it?
Well done, it is a Jewitt Holden, the one-off GT Coupe model to be precise, so another point to Carnut.
Australian Jim Jewitt built a number of two-seater sports cars, but this one was his only closed coupe. It was built in 1959, using a 2.5-litre Holden motor, mounted in a specially-commissioned Hedley Thomson twin 3" tube chassis. I'm pleased that it caused so much consternation!