Purdham joined in December 2001, following his selection for the England under-21 tour of South Africa, and an impressive start to the season with Whitehaven. He made his début for the Broncos in a Challenge Cup game against Batley Bulldogs.
On 20 May 2006, Rob set a new club record by scoring 34 points in 's 82–8 victory over Barrow Raiders in the Challenge Cup. The 13 goals in itself surpassed the previous record of 12 held by Paul Sykes. In 2007, he was appointed the club's captain, replacing Mark McLinden. In July 2011, Purdham announced he would be leaving Harlequins at the end of the season, and returning home to the family farm in Cumbria, England. He made a total of 197 appearances for the club, five games less than the club's record appearance holder Steele Retchless. Although he initially showed interest in re-signing with former club Whitehaven, he announced his retirement from playing altogether following medical advice. He played a total of 264 games during his professional career.
Representative career
Purdham made his representative début in 2001 for England's under-21 team during their tour of South Africa, scoring two tries in a 112–6 victory over the hosts. In 2003, Purdham represented England A, appearing twice during the 2003 European Nations Cup. England coach Paul Cullen named Purdham as captain in his 20-man training squad for the 2006 Federation Shield tournament. Purdham lifted the trophy with a 32–14 victory over Tonga. In September 2008 he was named in the England training squad for the 2008 Rugby League World Cup, and in October 2008 he was named in the final 24-man England squad, making two appearances in the tournament. Purdham also played twice for Cumbria.
Career highlights
Junior Clubs: Egremont Rangers, Whitehaven
First Grade Stats: 246 career games scoring 46 tries
Purdham's brother, Garry, who was also a professional rugby league footballer for Workington Town, died on 2 June 2010, south of Whitehaven, Cumbria, during a shooting spree in which a further 12 people were killed. Purdham was given compassionate leave by his club to travel back to Cumbria and has subsequently said that the positive response of the rugby league community has convinced him he was right not to give up his playing career following the tragedy.