When I first looked at this car it appeared to be quite small but if you look at certain details - wheels, bonnet (hood) length and the general heavy appearance - it became obvious that this car had been constructed from a larger car - almost certainly British.
I have recently posted several cars, based on Jaguars in particular, that have fascinated me by their sheer numbers and had a three-quarters rear view of this particular car (see below).
This particular car is the Slack Special built by William T. "Bill" Slack in the early/mid 1960s when he was the foreman at Caffyn's East Sussex garage. It was really a training exercise for Bill's trainee mechanics and was based on a shortened (by almost a metre!) 1954 Jaguar Mk VII chassis and clothed in a fairly basic but well-finished aluminium body.
Bill Slack retained the car for around 30 years before it was sold to a new owner in 1995.
Here's the photo from my photo library -
