The nephew of Tommy Vansittart, Alan was young striker who played regularly for the reserve team during the 1975/76 season, scoring 14 Suburban League and 2 cup goals in 31 appearances and a hat-trick in his final match for the Dons, a 7-1 friendly victory against Clovelli in a short end of season tour to Devon.

He moved on to Carshalton Athletic in 1976/77 and Whyteleafe in 1977/78.

More recently he was the First Team Coach at Kings College London University winning 4 League Championships and 3 cups in his 6 seasons there. He has also assisted the FA as a Coach Mentor, working as an FA Level 3 Licensed UEFA B coach. Alan's time is now split between being CEO and Founder of Biz BUI and Your Crypto Coach, also providing 1-2-1 coaching for young footballers, and helping the AFC Wimbledon Foundation with community events as a Foundation Coach.