Sky1's most popular comedy reopens it's check out for a 4th series. Bafta award-winning actress Miriam Margolyes (Harry Potter), Stephen Tompkinson (Wild at Heart) and Samuel Anderson (Doctor Who) join the cast for this latest series. Customers finally get to meet Colin's nan Rose (Margolyes) who has decided to get a job on the tills at Valco. If Colin wants to continue to be seen as the good boy his Nan thinks he is, then he is going to have to be on his best behaviour at work. Brian (Tompkinson) is Valco's new pharmacist. He has pretensions to be a doctor, although Valco's new pharmacy counter is the closest he'll get. Daniel (Anderson) is the new "Julie" and the voice of sanity amongst the mayhem. Next up is new boy Harry (Jack Carroll Britain s Got Talent). At just 16, he has recently finished his GCSEs with 9 A*s and is by far the brightest person Valco has ever had. He's a cheeky know-it-all, who gets away with anything because he's smart enough to deliver it with total innocence. Last to join the Valco staff is Charlotte (Aisling Bea Edinburgh Fringe So You Think You re Funny Award). She's the hopeless daughter and heiress of the man who owns Valco and daddy has decided that Gavin is the one to show her the ropes. This new series also stars the familiar Valco faces of Jason Watkins (Gavin), Rita May (Margaret), Carl Rice (Colin), Beverly Rudd (Lisa), Lorraine Cheshire (Sue), Faye Mckeever (Linda), Victor McGuire (Ian) and Dominic Coleman (Neville).