Pete and Jenny have separated, so he has been living at Adam and Rachel's. He moves back in with Jenny as her lodger when Adam and Rachel tire of his uncleanliness. As Karen and David return home with their new baby twins, Ellie and Olivia, Heather, Karen's ex-pat mother, arrives from Spain. At a dinner party, she takes a liking to Felix, one of David's clients. Jenny has also been invited, and is smitten with Robert, another client. Pete prepares breakfast for Jenny on their anniversary but is saddened when she receives flowers from Robert. Rachel tells Adam that her period is late.

Pete starts searching for a place of his own as Jenny and Robert start going on dates. He eventually finds a house-share with Matthew, a middle-aged divorced man who he is later shocked to discover is gay. Rachel's pregnancy turns out to be a false alarm. A visit to the doctor informs them that Rachel's inability to conceive might be related to her abortion. Jessica, a local political activist, arrives on the Marsdens' doorstep. David attends a local residents' meeting and becomes attracted to Jessica.

Pete and Ramona start seeing each other after an encounter in the park, and Jenny has to deal with her friends' reluctance to get to know Robert. Adam and Rachel attend their first appointment for Rachel's intracytoplasmic sperm injection. Heather smacks Josh but makes up with Karen and later returns to Spain. David organises his own 40th birthday party and decides to make it fancy-dress. At the party, he kisses Jessica, and Jenny becomes jealous when she sees Pete and Ramona dance. The next morning, David is surprised to find a Harley-Davidsonmotorbike in the kitchen.