In 1988, Piggford earned late selection for the 4 × 400 m relay squad for the 1988 Seoul Olympics. She didn't compete in the heats but came in as a replacement for Janet Smith for the final. The British quartet of Linda Keough, Jennifer Stoute, Piggford and Sally Gunnell, finished sixth in 3:26.89.[5]
In January 1990, Piggford competed at her second Commonwealth Games in Auckland. In the 400 metres final, she finished fifth in 53.45. In the 4 × 400 m relay, along with Stoute, Gunnell and Keough, she won a gold medal in 3:28.08. At the European Championships in Split, she ran 53.00 to reach the semi-finals of the 400 metres. She ran in the heats of the 4 x 400 metres relay. The British quartet went on to win a bronze medal in the final with Sally Gunnell replacing Piggford. This would be her final appearance at a major championships.
Piggford won both the UK title and the AAAs Indoor title in 1986. Her lifetime best in the 400 metres is 52.79, achieved in Edinburgh on 2 July 1989.[6] Her indoor best of 52.90 at The Hague in 1989, ranked her third on the UK all-time indoor list at the time, behind Sally Gunnell and Verona Elder. As of 2013, the time still ranks her in the UK indoor all-time top twenty.