Derek Riddell, a prominent Scottish actor, has made a significant impact on both television and film since his debut in the early 1990s. While he is widely recognized for his compelling portrayal of Richard Cawood in the critically acclaimed BBC series *Happy Valley*, collectors particularly seek out his role in the 2012 film *Bad Sugar*. This film, notable for its unique narrative and Riddell's standout performance, has become a sought-after title among enthusiasts of independent cinema and British film. With appearances in popular series such as *Gentleman Jack* and *Industry*, Riddell's versatility shines through, making his performances memorable and collectible. His guest roles in iconic series like *Doctor Who* and *Silent Witness* add further allure to his filmography, appealing to dedicated fans of these beloved franchises. His career showcases a rich tapestry of roles that not only highlight his talent but also contribute to the cultural landscape of contemporary British television and film, making his works valuable additions to any serious collector's library.