Series 6 - Episode 12 - S6-E12
Plot hole: In the scene at Jim and Diane's reception Karen Betts and Neil Greyling come in with photo evidence of Jim after the hit and run. Jim states that he was with Diane that night and Diane clarifies it. But Sylvia Hollanby says that he couldn't have been with Diane, because she was with her after her and Bobby's wedding anniversary night, comforting her. But that was the night that Michelle Dockley attacked Jim in her cell. The night that Jim did the hit and run, Jim left work early and Sylvia was left to do the night shift herself.