Episode 5

David has hired a private detective to follow Alison - and his worst fears have been realised. He confronts her about the affair and asks if they can get back together. But Alison and Graham are planning to get married. As a parting shot, David drops a bombshell about his brother: perhaps Graham's motives aren't as romantic as they seem. When Sarah catches David and Elaine together, she swallows her pride and returns to her mother. And there's another shock for Virginia when unsuspecting Mike arrives to tell her that Megan has left him - can she cover up her re-kindled affair to Tamsin, or will she find herself alone? Alison has an announcement to make to the girls: Graham is moving in.