Former Detective Chief Inspector Jackie Malton, 70, was speaking in new BBC documentary series Bent Coppers. The three-episode series tells the story of institutionalised corruption in the Metropolitan and City of London police in the 1970s. Ms Malton retired from the Met in 1997 after a 30-year career before going on to advise producers of police television shows. Prime Suspect creator Lynda La Plante spoke to Ms Malton for hours to create no-nonsense officer DCI Jane Tennison. The character was portrayed by Helen Mirren in the long-running show before La Plante released a book of the same name. Speaking in the final Bent Coppers episode, which airs tonight, she told how 'everybody just stood up and walked out' after she entered the police canteen following the suspension of a fellow officer suspected of planting drugs on suspects.