 Complete the following phrase:  Callender competed in the 1988 Summer Olympics. He represented England and competed in the 100 metres and won a silver medal in the 4 x 100 metres relay event, at the 1986 Commonwealth Games in Edinburgh, Scotland. Four years later he represented England and won a gold medal in the 4 x 100 metres relay event with John Regis, Marcus Adam, Linford Christie and Tony Jarrett heat runner, at the 1990 Commonwealth Games in Auckland, New Zealand. In the 