I don’t know a lot about this one. It’s something that I came across on the Federation of Sidecar Clubs’ stand at the BMF Show in Peterborough a couple of years ago.
It’s badged as an Austel and appears to have a Hedingham or modified Squire sidecar attached (although I am prepared to be corrected on this point).
From the little information available online, it appears that Austel produced a custom motorcycle designed for sidecar operation with components more often found in cars, such as the 1300cc Leyland engine with a four speed manual gearbox with reverse gear, car tires and brakes, car size drive couplings, and so forth. Leading link forks were fitted as standard.
It was also apparently available in kit form.