Look forward to that...

The first usage of the 4-cyl version of that 6, the reason it was built, was as a replacement for Jeep engines made locally so they didn't take up shipping space.

Then:

Austin 16 (is that right?)
A70
London cabs
A90 Atlantic
Nuffield tractors
Morris Commercial trucks
Austin Healey
100S Racing Healeys
Healey LSR cars

As for the six, it was out to 4-litres by 1947 or so for the A125 (or 135?) and also in trucks. Another two racing Specials I know of using them in Australia was the Sheerline Special (built by the Wylies) and the Stewand of Norm Andrews. In the latter it was a replacement for... a Jeep engine!

Here it is in Austin-powered form: