Career
Mercer began his racing career in Sportscars in 1977 competing in Group 5/6. He drove part-time in the FIA World Endurance Championship and Thundersports races from 1982 to 1989. He made one start in 1992 and made 11 British Formula 3000/Two starts from 1992 to 1994, finishing 13th in the championship those two years.
He then went on to race a 1983 Ram in Historic F1 then moved on to racing a 1990 Spice Group C car in historic events with much success and which he still currently races to a high level