Episode 7820 ( 12th March 2012 ) Plot . Izzy , Beth , Julie , Hayley , Sean and Fiz are locked outside the factory , wondering what ' s going on . Michelle arrives and announces that Carla is still at the police station but meantime , it ' s business as usual . Beth wonders if they will be getting paid . At the police station , Carla continues to be grilled by DS Nash who confronts her with the whisky bottle which has her prints on it . The machinists work with uncertainty . Michelle is thrown when Anne arrives , visibly upset , insisting that Michelle has no right to be running the factory . Carla continues to battle with DS Nash ; answering his questions with cocky confidence , saying that if she was the murderer , she would not have been stupid enough to allow the weapon to be discovered . At No . 11 , Paul returns to Eileen and Lesley , reporting that the building work on his house is going slowly . He has flowers for Lesley as it is their 24th wedding anniversary . DS Nash grills Carla about the missing contract and her obvious motive for stealing it . Sylvia calls in The Kabin and Norris advises her of Rita ' s engagement celebration . Paul and Lesley call in to choose an anniversary card for Paul . Lesley remembers that their wedding cake was chocolate and that her mother hated it . Paul is heartened by her long term memory recollection . DC Grant searches Peter ' s flat for the missing contract without success . Carla remains defiant and argumentative during her interview , acknowledging with satisfaction that she would happily have killed Frank for raping her , but that she did not . She falters when asked if she didn ' t kill him , who did ? At the Rovers , Karl is on the phone being pressurised to pay back a loan . In the bar , Rita and Tina discuss her party . Karl infuriates Rita by upping the quote for the catering , so she cancels the buffet . Carla is triumphant when she senses that the search of Peter ' s flat has not revealed the missing contract and she is bailed for a week . Paul , Eileen and Lesley enjoy tea and cakes at the café , served by Sylvia . Paul is downcast by Lesley ' s return to complete confusion . Dr Carter calls in and Eileen prompts Paul that he needs to discuss the possibility of residential care for Lesley . Peter is shocked when Carla returns to the bookies . Carla immediately sets off for the factory ; Peter is unclear about what exactly she has said to the police . Rita , Dennis and Norris are discussing the wisdom of Rita cancelling her buffet when Stella arrives at The Kabin . Noticing that Rita is disappointed , she asks what ' s wrong . Anne is shocked to see Carla arrive on the factory floor . The workers question Carla about what has happened , Anne demands to know what she had done with the missing contract . It is agreed that everyone is strained , so the factory can shut early . In the Rovers , Stella berates Karl for his treatment of Rita ; Tina gloats . At No . 11 , Dr Carter drops nursing home brochures off for Paul , who is clearly uncomfortable about the idea . Lesley is looking at family photos and her memory is once again active . Paul is excited , but Eileen clearly has mixed feelings . Back at the flat , Carla is stunned when Michelle produces the contract from her handbag and admits it was she who took it .