[citation needed] Born in Romford, Essex, Coffill started his career in the Watford youth system.
Manager Mike Keen gave 18-year-old Coffill his professional debut on 4 October 1975, in a 1–1 Fourth Division draw against Stockport County at Vicarage Road.
[1] Keen was replaced as manager by Graham Taylor in June 1977, and the 1977–78 season was Coffill's last as a Watford player.
[2] Coffill played regularly for Torquay, making 122 league appearances over three and a half years, and scoring 11 goals.
[2] After 69 league appearances, he left Northampton at the end of his two-year contract, moving into non-league football with Aylesbury United and Kidderminster Harriers.