© Channel 4 It can easily happen. After getting off to a flying start in its first series, a TV show can quickly go off the rails. It's a pity when it happens. And unfortunately that appears to be the case with Channel 4's 'Screw'. © Channel 4 When the first series of Rob Williams' prison drama aired in January last year , it landed with quite a swagger. It was fresh, pacy, tense, tongue in cheek and billed as a comedy drama. In truth, though, the drama outweighed the comedy. It also provided a decent showcase for the talents of Nina Sosanya and a post ' Derry Girls ' Jamie Lee O'Donnell in the lead roles of Leigh Henry and Rose Gill. © Channel 4 Sosanya's character was as a senior officer in charge of a wing in a men's prison called Long Marsh. Rose was a new recruit. The show's big hook was that Rose was in hoc to a crime gang who her brother owed drug money to. This meant also answering to Ben Tavassoli's prisoner Louis Costa while she