Hart reached the Football League Linesmen's List at the age of 29 in 1977.
One of his early games was between Manchester City and Huddersfield at Maine Road on 7 November 1987, when the home side won 10–1, the Yorkshire team's only goal being a penalty.
[1] He became further established and was appointed as one of the first Premier League referees for the 1992–93 season.
[2] The following season was his last one as a top-class referee, and saw his greatest honour as he refereed the Coca-Cola Cup Final between Aston Villa and Leeds United at Wembley, with the Midlands side winning 3–0.
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