He competed at the 1980 Summer Olympics and the 1984 Summer Olympics.[1] He appeared in four Commonwealth Games winning three medals.
The first medal (a bronze) came representing England in the 62 kg featherweight division, at the 1978 Commonwealth Games in Edmonton, Canada.[2] Four years later he won a gold medal representing England and in the 57 kg bantamweight division, at the 1982 Commonwealth Games in Brisbane, Australia.[3] The third medal (another bronze) was at the 1986 Commonwealth Games in Edinburgh[4] and a fourth Games appearance was at the 1994 Commonwealth Games, where he finished in seventh place.[5]
Aspen was a nine-times winner of the British Wrestling Championships; bantamweight (1981, 1982, 1983), featherweight (1979, 1980, 1984, 1986, 1989) and lightweight in 1994.[6]