Disgraced sprinter Ben Johnson is to mark 25 years since his infamous 100m Olympics by launching a global anti-doping campaign in London.

Johnson, who failed a drugs test after winning the 100m at the Seoul Olympics on September 24 1988, has arrived in the UK at the start of a world tour to launch a new anti-doping initiative.

He will promote a campaign, called 'Choose The Right Track' which has been launched by the sportswear company SKINS, which has also been active in calling for a reform of cycling following the Lance Armstrong scandal.

Johnson, who is not being paid for his participation, will tour his home country of Canada as well as the United States, Australia and Japan culminating in a visit to the Jamsil Olympic Stadium in Seoul on September 24.

SKINS chairman Jaimie Fuller will use the campaign to propose a number of changes to the anti-doping system, including setting up an athlete support council to advise sportsmen and women.

Fuller said: "Ben personified the modern era of doping but after 25 years, he's now in the best position to publicise this campaign.

"As an athlete, he had no outside help when he needed it and the athlete support council is something he can definitely relate to.

"After a quarter of a century, there remains a complete lack of trust between the athletes and administrators and the ASC would assist in bridging the gap."

Johnson's world record-breaking time was erased from the record books following his positive test, and the USA's Carl Lewis was given the gold medal instead, with Britain's Linford Christie receiving silver.