On 20 May 2006, Rob set a new Quins club record by scoring 34 points (2 tries, 13 goals) in Harlequins RL'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 (252 appearances at club level, and 12 representative appearances).
On 20 May 2006, Rob set a new Quins club record by scoring 34 points (2 tries, 13 goals) in Harlequins RL'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 (252 appearances at club level, and 12 representative appearances).
Rob Purdham