On Millwall's books as a junior, he was working as a tally clerk in the London Docks when Wimbledon signed him from Tooting & Mitcham in 1967. He made his debut in place of Frank Smith at Stevenage in April 1968 and went on to be virtually ever present in the Wimbledon goal for the next decade. Between 17 January 1970 and 22 August 1977 he did not miss a match - a remarkable 314 consecutive games.

He gained nationwide fame when he saved Peter Lorimer's penalty in an FA Cup tie with Leeds in January 1975. The story of the tally clerk who had defied the league champions kept the back pages full during the two weeks between the fourth round tie and the replay at Selhurst Park. Having kept a clean sheet at Elland Road he was only beaten in the replay when Johnnie Giles' shot was deflected past him by Dave Bassett.

With the likes of Billy Edwards, Dave Donaldson and Jeff Bryant in front of him, Guy was part of one of the meanest defences the Southern League has ever seen. Conceding just 22 goals in 42 games in 1976-77, the Dons won their third successive Southern League title and a place in the Football League. Having made his Division Four debut against Halifax on the opening day he was soon replaced by first Richard Teale and then, the New Year, by Ray Goddard.

He left Wimbledon for Maidstone United in the summer of 1978 after appearing in more than 500 games for the Dons.

One of the most iconic figures in the club's history, he became the high profile President of AFC Wimbledon when the club was formed in 2002.