Thanks for the lock woodinsight, but I have been unable to find anything at all about this car.
I can find no mention in any books nor will Google yield any results.
It looks a bit similar to the Buchanan, but not quite similar enough to have used the body.
Nor does it seem to have been made by the same people.
It's clearly named after the Caversham racetrack in Western Australia rather than a Berkshire village, but I can't find that it ever raced there. Caversham's heyday was the 1950s and it finally closed in 1968.
I reckon it must have been made around the same time as the first Buchanans, around 1958?