Morley won her second UK title in 1983 in 56.67 secs, before going on to finish seventh in the final of the 400 metres hurdles at the 1983 World Championships in Helsinki in 56.04 secs, to break Christine Warden's 1979 British record of 56.06. Morley's record was broken in 1988 by Sally Gunnell. In 1984, following injury during the winter season, she reached the semifinals at the Los Angeles Olympics, running 56.67.
Morley's final year ranked in the UK top three was 1985, when under her married name of Sue Chick, she ranked third with a season's best of 58.15 secs.[4] As of 2018, her best time of 56.04 secs, ranks her 13th on the UK all-time list.