Thanks, targa!
It never really occured to me to search the newspapers (me, one of the 'pioneers' of expansive newspaper research for motor racing history! - double )
Anyway, meanwhile I have found something on the interweb, academic too (from an article at Cambridge University Press, dealing predominantly with Spain - https://www.cambridg...A201D2A70096897) :
First, total production:
Registrations:
Finally, per capita (by thousands):
Interesting figures! Mainly surprised by Canada's high ranking, but overall within expectations. Yes, I think you can say that Britain was underperforming, but perhaps not by as much as I would have expected.
The Canadian figures are distorted in that they will include a lot of American cars destined for export, but built in Canada with RHD to take advantage of British Empire trading rules and avoid import duties when they arrived in South Africa, India, Malaya, Australia, New Zealand and other colonial outposts like Kenya and Nigeria. Lots of Buicks, Chevrolets and Studebakers ...
I mentioned taxation above - as Michael Sedgwick argues in his book 'Cars of the 30s' (Batsford, 1970) the UK's system of taxation was 'the answer to the tax-man's prayer' as it created types of cars which were peculiarly suited to the British market, but seldom seen elsewhere - 'outside those areas which were marked in red in the jingoistic school atlases, British cars were little known.' ... 'British industry built for Britons'. LHD options were virtually unknown. Conversely, very few small cars built abroad fitted neatly into the RAC tax horsepower system, which was based purely on the bore and number of cylinders. He quotes the 3-litre Bentley and Opel Olympia as examples, both of which were taxed as 'Sixteens', even though the Opel's engine was only half the size and had - I would suspect - less than half the 'grunt' of the Bentley.