Neil, I can't recall ever seeing a plastic injection kit of any of the Morris Minor variants. Depending on what scale model you're after, I'm pretty certain that if you have a look at Railway Modeller magazine you will find a white metal kit of one, but probably in the small scale of approx 1/76, or 00 scale as they call it.

Al, I'm pretty certain that Airfix used to do a 1/32 kit of the Sunbeam Rapier, but that was a long time ago. I seem to remember that Pay Moss (sister of one Stirling Moss, and married to rally ace Eric Carlsson) used to rally one... those were the days!