Yep, the 1-11 -475 was built in the UK (at Hurn actually) and was desinged to be the version that had rough field capability. It had the -400 series fusalarge with a bulged undercarrige bay to enable the low pressure tyres to be retracted, -500 series wing's (2ft 6in per wing longer than -400) and -500 series engines which gave it the best perfomance of the versions.
Oddly, with the -400 length and -500 wings it meant the aircraft was "Square" 93ft 6in both ways !.
If You are ever near Weybridge in Surrey, Visit the Brooklands Museum and see the prototype 1-11-475 G-ASYD (also was the prototype -400, -500 and -670!)
M5DND