While we're on the subject of WW tires, imho they look great on a 40 ford woody.
A search for listings of white wall in "classic cars" on ebay uk resulted in 5 American cars, 2 British cars, 1 German car and 1 Italian car with white wall tires.
The British cars were a RR and a Jag E 2+2.
This is out of 15 RRs available and about 80 Jags available.
Clearly not a British thing.
A comparable search in ebay motors com gave 120 cars which included mostly 30's through 70's American cars, 2 RRs and 3 VWs.
Clearly an American thing.
So I guess you'll have something nearly unique!