I am making a presumption here, but I think this Morris 10 sedan I came across parked in an industrial estate was most likely there for a service at a nearby workshop that specialises in older cars.
(Edit – the car is a Morris 10 not a 12 as I originally wrote)
It was a typical case of seeing something interesting when you don’t have time to stop and photograph a car more fully, so I am going off what I can see.
British cars at this time were often named after their taxable or RAC horsepower rating, which was calculated based on the combined area of the pistons. Originally this would have been an effective, simple way to calculate actual horsepower, but not for long as engines were developed. There were of course unintended consequences too; new engines were developed with very long strokes to minimise the amount of tax paid. This was completely precedented of course – have you heard of the window tax?
This includes the Morris bonnet mascot which is quite distinct from the winged “A” of the otherwise very similar Austin 10. I understand that both cars used essentially the same Pressed Steel body in UK manufacture, while in Australia things were similar (shared bodies) but different in that assembly of Austin cars in this era was done by the distributor in each state. In South Australia the bodies were built by General Motors-Holden, carrying on from before GM bought Holdens Motor Body Builders, while in New South Wales it was the Pressed Metal Corporation. Despite the name the latter was not related to Pressed Steel in the UK.
After WW2 things would change when Austin (Australia) Pty Ltd merged with Nuffield to form British Motor Corporation (Australia) in 1954, when assembly of most cars was moved to that companies own factories. Newer cars that were designed after the war were in production by this time too, but that is a story for another time.