Credit: BBC Rob Hollins is questioned by his wife Karen after she finds an important letter on Doctors. What's wrong with Rob? What is he hiding from her? What’s wrong with Rob Hollins (played by Chris Walker) on Doctors? (1:45pm on BBC One, see our TV Guide for full listings) His wife Karen (Jan Pearson) is starting to wonder if he’s keeping something from her. The copper is having trouble sleeping. He has also been spending more time at work since new colleague Harriet Shelton (Carley Stenson) arrived on the scene. Rob Hollins seems happier spending time with new colleague Harriet on Doctors