Fritz Dirtl from Austria was due to ride for Norwich at one time but when his Continental bookins became known he would not have been available very often so the idea was dropped. Did Robert Funk ever come to U K to ride?
The Killmeyer brothers, Karl & Leopold, both rode at Norwich I recall.
South Africans - Alan Chambers who was an Englishman, naturalised, I think.
Tom & Dick Sayer, twins, who were riding at Norwich for a while.
Dennis Newton, another of the naturalised riders from the past.
Naturalised riders will always be a problem as to where they fit in. Bert Spencer and Tiger Hart are called Aussies but were born in England as was Ron Johnson up in Scotland. Nowadays Andy Smith and Rune Holta just chose to use another nationalities licence and this is not the same thing.