Jansson initially appeared in the UK on 23 July 1970 while touring with the Young Sweden team in a British League Division Two test series against Young England. He rode at Teesside, scoring 10 points. He was injured in the second test match, at Workington, the following night, and he returned to Sweden.
He came to England in 1971 to ride for the Wembley Lions making his debut on 9 April, in an away match against Wolverhampton, where he scored 6 points. But his stay with the Lions only lasted for three British League Division One matches. Although he did continue to race in the UK for the Young Sweden touring team, against Young England in a British League Division Two test series. He never rode a home match at Wembley for the Lions, because at this time their home matches were taking place at Newport, in Wales.
In 1972 he made his debut for the Wimbledon Dons on 15 June, at home to Wolverhampton, scoring 10 points. He later returned to Sweden to complete his National Service during the 1973 British League season, after competing in several league matches.
In 1974 when all Swedish based riders were banned from riding in the British League, he only rode in open meetings: at Wimbledon, and in an International Test Match series against England. He also became the champion of Sweden by winning the 1974 Speedway Swedish Individual Championship.[6] In 1975 he won his second World Pairs Championship with Anders Michanek.[7][8]
His last appearance at Plough Lane (Wimbledon's home) was on Thursday, 13 May 1976, in a Marlboro Southern Riders Championship qualifying round (which he was the reigning Champion). He won this meeting with a 15-point maximum. Prior to this meeting he beat Dave Jessup (Reading) 2-1 (after suffering a first race engine failure) to retain his Golden Helmet British Match Race Championship. Jansson's last meeting in the UK was at Halifax, in a British League Division One match, on Saturday, 15 May. He scored 12 points from five rides.
In Sweden he rode for Smederna. At the time of his death, aged only twenty-three, he had already appeared in four World finals. Jansson also rode in four speedway World Team Cup Finals for Sweden: in 1972, 1973, 1974, and 1975.
Tommy Jansson was killed in an accident in a World Championship qualifying race at Gubbængens Idrottsplads speedway in Stockholm on the 20 May 1976.[9]
He was the last rider to hold the British Speedway Golden Helmet. The original Golden Helmet was given to his family after his death.[7]
Family
He was the son of former Swedish International speedway rider Joel Jansson. His brother Bo (Bosse) Jansson was also a speedway rider.