As an amateur, Mittee won the 1973 Amateur Boxing Association of England (ABAE) Junior Class-B title, while boxing for Crown and Manor ABC, Hoxton, London.[1] He subsequently won the 1976 ABAE lightweight title against Thomas McCallum (Sparta BC) while boxing for Repton Amateur Boxing Club, Bethnal Green, London.[2]
As a professional, Mittee won the British Boxing Board of Control (BBBofC) Southern (England) Area light welterweight title, the BBBofC British welterweight title and Commonwealth welterweight title, and was a challenger for the BBBofC British light welterweight title against Clinton McKenzie, and European Boxing Union (EBU) welterweight title against Lloyd Honeyghan. His professional fighting weight varied from 139 lb (63 kg; 9 st 13 lb), or light welterweight, to 151+1⁄2 lb (68.7 kg; 10 st 11.5 lb), or light middleweight.[4]