[3] 1975 – Yorkshire RL Representative 1975 – England World Cup Squad 1975 – 1977 – England International 1974/75 – Yorkshire Cup Winner 1974/75 – Rugby League 'Top Try Scorer' 1974/75 to 1984/85 – Hull KR 'Most tries in a season record' (42 in 1974/75) 1975/76 – Yorkshire Cup Runner Up 1977/78 – BBC2 Floodlight Trophy Winner 1978/79 – Rugby League Championship Winner Hull Kingston Rovers Heritage No: 749 Born in Redcar, he was educated at Sir William Turners Grammar School and Ponteland College.
He made his debut for Hull Kingston Rovers in 1971 playing centre, but was moved to the wing to utilise his pace.
He was the joint record holder for tries in one match for Hull KR scoring six in 1974, and was top of rugby league try scorers in 1974–75.
The record for the most tries in a BBC2 Floodlit Trophy Final is two, and is jointly held by Dunn, Roy Mathias, Peter Glynn, and Stuart Wright.
After retiring as a rugby league footballer at Hull Kingston Rovers, he joined the coaching staff, promoted in 1986 to assistant coach to Roger Millward – then George Fairbairn – Dunn was a PE teacher at Bransholme High School (later Winifred Holtby Academy) in Kingston upon Hull for over 30 years.