Whitbread had won the silver medal at the inaugural World Championships in 1983. She was also known for her rivalry with fellow British javelin thrower Tessa Sanderson, who won the gold medal at the 1984 Summer Olympics in Los Angeles with Whitbread finishing in bronze medal position. In the 1988 Olympics in Seoul, Whitbread won the silver medal behind Petra Felke, who had broken the world record in the interim.