[1] He played in the 2–0 2004 Supporters Direct Cup win over AFC Wimbledon on 20 July 2004 and replaced Chris Hargreaves after 87 minutes.
[2] Hillier received his maiden call into the first team squad for a Football League Trophy first round match against Milton Keynes Dons on 28 September 2004.
[7] He made his only first team appearance for the club as a 51st-minute substitute for Michael Woolner in a 2–0 defeat to Bromley on 25 October 2005 and departed at the end of the 2005–06 season.
[8] Hillier rejoined Combined Counties League Premier Division club North Greenford United on loan in November 2005, until the end of the 2005–06 season.
[12] Hillier signed for North Greenford United for the fourth time during the 2008 off-season and was a virtual ever-present during the 2008–09 season,[13] making 42 appearances and helping the Blues to a second-place finish in the Combined Counties League Premier Division.
[19] In the interim, he played for Middlesex County League Premier Division club New Hanford and spent time recovering from a tendon injury.