Bob manages to get one of the witnesses to remember a specific date that they saw Viv going into the house with Freddie and he checks the post office records and is shocked to see that Viv was off that day. Bob questions Viv about her whereabouts and a broken-hearted, betrayed Viv tells Bob to leave. Louise is worried about the Hopes and she suggests to Bob that he may have got it wrong but he insists that his marriage is on its knees (thetvdb.com)