Armstrong-Siddeley 12/6 sport prototype?
Not an Armstrong-Siddeley
You say I'm a few years out. Since Jensen started in 1934, is this car from the 1940's?
Although Jensen Motors was only founded in 1934 the Jensen brothers were very small-scale coachbuilders before that date..
Star Little Comet Sports by Jensen 1932?
I've already tried the Star, Malcolm.
I'm going to try a different approach - it's a 0ne-off built on the chassis of a not-well-known marque, so I'm going to assume that this marque produced cars using proprietary engines. Ford engine?
As nicanary says we've already discounted Star, but you
are right with the date - 1932!
And yes, you're right nicanary in that the marque used proprietary engines; not Ford though.
And I didn't say that the chassis was a not-well known marque, but that it was not a major car manufacturer. The name is well enough known!