Career
Between 2008 and 2013, Justham played for semi-professional clubs Waltham Forest, Leyton, Redbridge, Brentwood Town and East Thurrock United, alongside working night shifts on the London Underground. His potential was spotted by clubs higher up the footballing pyramid and he went on trial both at Reading and West Ham United, before being signed by Conference Premier side Luton Town in May 2013. In the 2014-2015 season, an injury to regular goalkeeper Mark Tyler meant Justham played in the final 15 games of the season.
He kept five clean sheets and his performances saw reported interest from League One clubs Bradford City and Gillingham.
On 23 April 2015, Justham signed a two-year contract extension with Luton.