Caroline and Gillian become unexpectedly close when Alan and Celia go missing all night.

Alan finds it hard to choose his best man, and John outs Caroline and Kate.

Alan and Celia's first day as a married couple is full of tension. A new arrival manages to surprise everybody. Caroline finds a way to buy John out of the house.

Gillian is upset after Celia inadvertently lets slip a huge personal secret she has kept since she was fifteen. Alan and Gillian's already relationship hits the rocks as he distances himself from her even motre. Kate is made to feel awkward around Lawrence, who finds his mother's new relationship hard to accept.

Sad news inspires Alan and Celia to have another wedding ceremony for family and friends; Caroline and Kate spend a weekend away, but it doesn't go as planned; and Judith causes trouble between Gillian and Robbie.

Celia introduces Alan to her sister, Muriel. Caroline is shocked to find out that Kate is pregnant. Gillian gets drunk and shares a dark secret with Caroline.

Gillian wakes up having spent the on the sofa. As she remembers her confession to Caroline the night before she is terrified. Caroline ends up being filled with empathy though. Preparations are underway for Alan and Celia’s big day.