Pascoe was born in Portsmouth, England. He was educated at Portsmouth Southern Grammar School for Boys. He undertook higher education at Borough Road College, Isleworth, where he received a Certificate in Education, and the University of London, where he received an Honours degree in Education. He married Della Patricia James in 1970. They have one son and one daughter.
Pascoe won medals in the Olympic Games, the European Championships, and the Commonwealth Games., also the European Indoor Games.
After the 1974 Commonwealth Games victory Pascoe achieved a major distinction, in celebration he performed one of the great televised sporting bloopers. While doing his victory lap in reverse, Pascoe attempted to leap the last hurdle still remaining from the race and badly missed the hurdle, falling onto his back and denting the hurdle. Trying to regain his dignity, he circled around to attempt the jump the hurdle in another lane and fell identically. Laughing it off, he got up again and started turning over the other hurdles. See the video on YouTube. In winning the race he also achieved the minor distinction of running the seventh fastest 400-metre hurdle time, third fastest time by a British athlete, to that date (behind Jim Seymour, Ralph Mann, David Hemery and the then world record holder John Akii-Bua) at 48.8, despite running in the outside lane.
Olympics:Silver, 4 × 400 m Relay, 1972
European Athletics Championships:Bronze, 110 m Hurdles, 1969
Silver, 110 m Hurdles, 1971
Gold, 400 m Hurdles, 1974
Gold, 4 × 400 m Relay, 1974
Commonwealth Games:Gold, 400 m Hurdles, 1974
Silver, 4 × 400 m Relay, 1974
Bronze, 400 m Hurdles, 1978
European Indoor Games:Gold, 50 m Hurdles, 1969
Pascoe's personal best times are:200 m, 15 July 1972, London, 20.92
110 m Hurdles, 17 June 1972, Edinburgh, 13.79
400 m Hurdles, 30 June 1975, Stockholm, 48.59
Pascoe competed in athletics at a time when it was supposed to be an amateur activity. He thus needed paid employment during his athletics career. He was a teacher at Dulwich College (1971–1974), and a lecturer in physical education at Borough Road College, Isleworth (1974–1980).
Pascoe was also able to get financial support during the 1970s from membership of several QUANGOs; the Sports Council (1974–1980), the Minister for Sports' Working Party on Centres of Sporting Excellence (1975–1979), and the BBC Advisory Council (1975–1979).
After competitive athletics, Pascoe became involved in events marketing and consulting. He set up Alan Pascoe Associates Ltd. (later named API), of which he was Director (1976–1983), managing director (1983), Chairman (1985–1988) and CEO (1994–1998). Pascoe sold API in 1998, then started another company, Fast Track Events Ltd., of which he is the chairman.
Other business appointments were as a Director of the Aegis Group (later named WCRS) (1986–1992) and Chairman of Carat Sponsorship (1987–1992).
Pascoe criticised the British government for withdrawing from hosting the World Athletics Championships in 2001. He claimed that the Prime Minister, Tony Blair, had broken a written undertaking to host the games. Pascoe believed that the decision amounted to the sport being cold-bloodedly "stabbed in the back". He believed that Blair had damaged Britain, by making the nation look foolish, and by causing the loss of both GBP 15–20 million in revenue, and a stadium suitable for top-class athletics. Such a stadium, he believed, was essential for developing home talent into world-class athletes.
In September 2003, Pascoe was appointed vice-chairman of the London bid for the 2012 Summer Olympics, which was ultimately successful.
Pascoe received an MBE in 1975 and an honorary doctorate from Brunel University in 1997.