Bayfield was born in Bedford and was educated at Bedford School. He served with the Metropolitan Police from 1985 to 1989, before transferring to Bedfordshire Police. The 208 cm (6 ft 10in) tall Bayfield made his England debut in 1991, and although he was omitted from the 1991 World Cup squad, he was a part of the 1992 Five Nations Grand Slam winning side. He went on the 1993 British Lions tour to New Zealand, and was part of the 1995 World Cup squad. He would play 18 times partnering Martin Johnson. His final appearance for England came in the 1996 Five Nations match against Wales.