Friday, 8.30pm, ABC1 After nine series there are not many new tricks to teach the writers of this long and beloved series. For viewers not in the know, this is a show about old detectives, in this episode Brian Lane (Alun Armstrong) and Gerry Standing (Dennis Waterman), brought out of retirement to crack unsolved crimes under the leadership of the younger, albeit no longer youthful, Detective Superintendent Sandra Pullman (Amanda Redman). Tonight they are investigating a longstanding cold case involving a body pulled from freezing waters in 2008. Officialdom says the woman killed herself after she lost a laptop that cost her a big promotion. But what was on the computer and does her posh boss have anything to hide, apart from being a pompous pretend patrician? Unless of course the upset sister or the deaf lover are guilty. In the end experience counts and the case is solved. Former star James Bolam quit the show last year, saying the scripts are stale, which was unfair. The whodunit dimension is neither better nor worse than the present run of detective dramas on the box. But the characters are not all that interesting and DS Pullman’s occasional gibes at sexism and Lane’s class consciousness are tick-the-box social comment. As Waterman sings in the theme song, the team is indeed getting to the end of the day.