Career
Born in Farnborough, London, Gwillim began his career as a junior at Welling United and Crystal Palace, before moving into non-League football, playing for such teams as Farnborough Town, Ashford Town, Bishop"s Stortford and Histon. After Histon rejected a formal approach from Dagenham & Redbridge in November 2009, Gwillim eventually signed for Dagenham & Redbridge in June 2010 on a two-year deal. Gwillim made his professional debut on 31 August 2010, in a 0–1 defeat in the Football League Trophy against Charlton Athletic.
After the match, Gwillim publicly announced his plans to usurp Damien McCrory as the club"s first-choice left back.
Gwillim made his debut in the Football League on 21 September 2010. On 13 January 2011, Gwillim agreed a loan deal with AFC Wimbledon, playing with them in the 2011 Conference play-off final.
Gwillim signed permanently for the club in July 2011. He then returned to non-league football with Sutton United and Ebbsfleet United.