I think my previous post on the short stay thread actually belongs here:
He remained in Britain until 1971, riding for Wembley Lions so it was certainly not a "short stay" for Sverre Harrfeldt. But I thought I would mention that I saw the Norwegian make his debut for Wimbledon in 1963. I recall he rode an introductory lap around the track carrying a Norwegian flag before the meeting. He moved on to West Ham and I believe Olle Nygren went in the opposite direction in a swap deal. At West Ham he was undoubtedly a world class performer recording two ten plus average seasons and finishing runner-up to Barry Briggs in the 1966 world final.