[3] Allder began his career with Second Division club Millwall and signed apprentice terms in April 1968 for £4 a week.
[4] The move was cancelled after Jago replaced Fenton as Millwall manager, which meant Allder remained at The Den.
[4] Allder had a one-month trial with Fourth Division club Torquay United in August 1977 and made one appearance as a substitute for Lindsay Parsons in a League Cup tie away at Cardiff City.
[4][5] Watford went on to win the 1977–78 Fourth Division title and Allder received a winners' medal from chairman Elton John after the final game of the season against Brentford.
[4] Allder was released at the end of the 1979–80 season and made 95 appearances and scored three goals during his time at Griffin Park.