Easter won six Scottish swimming championships and broke eight Scottish swimming records in 1982. He swam for Great Britain in the European Cup and competed for Scotland in the 1982 Commonwealth Games in Brisbane], Australia where he won a bronze medal in the 4x200 metre freestyle relay with Neil Cochran, Douglas Campbell and Graeme Wilson, and a bronze medal in the 4x100 metre medley relay with Douglas Campbell, Iain Cambell and William McGoldrick. He represented Great Britain at the 1982 World Aquatics Championships in Guayaquil, Ecuador. In 1983 he broke eight Scottish records, was named the outstanding swimmer at the British short-course championships in Cardiff and represented Great Britain in an international swimming matches against Holland, Russia and Canada. In 1984 he broke the Scottish 100 and 200 m freestyle and 200 m butterfly records before winning his bronze medal at the Olympics. In 1985 he broke the Scottish 200 m freestyle record again and won the 400 m freestyle and 200 m butterfly championships. He was selected to swim for Scotland at the 1986 Commonwealth Games but had to withdraw because of illness.