Career
He rode for the Aldershot Shots, the Wimbledon Dons and the Southampton Saints. He moved to England in 1951 and joined the third division team, Aldershot. He qualified as second reserve for the 1951 World Final.
The following year he transferred to the Wimbledon team
He rode in the 1953 World Final and finished in 3rd place. In 1954 Mardon was one of the highest individual points scorers in the National League.
At the beginning of 1955 he decided to retire and live in New Zealand. After a four-year break Southampton persuaded him to return to British speedway in 1959.
He rode the Saints for a year and he qualified for the World final.
He died on 6 August 2015 in Christchurch. Mardon had four appearances in world championship finals:
1951 - London, Wembley Stadium - Reserve - Did Not Ride
1953 - London, Wembley Stadium - 3rd - 12pts
1954 - London, Wembley Stadium - 11th - 5pts
1959 - London, Wembley Stadium - 10th - 6pts.