Mitch has decided it’s time to get a career, and fancies training as a teacher. The problem is he doesn’t have the grades to get into teacher training college, so has to go back to school to re-sit the exam. Mitch finds himself in a classroom full of sixteen year olds, including bad-boy Chris who quickly leads Mitch astray. It’s up to Mitch’s naively optimistic young teacher and his ‘parents’ Alice and Richie to keep him on the straight and narrow, so that the student may yet become the teacher.

It’s Richie’s first day back at work after paternity leave, and Mitch and Alice are worried they won’t be able to cope without him. Richie is more worried about his idiotic new PA Billy (Jonny Sweet). After experiencing the First Day Back From Hell, Richie returns exhausted to the flat, only to get into an argument with Mitch for not appreciating his efforts as a domestic goddess. After the argument unexpectedly escalates into accidental violence, Richie discovers that only Billy can help undo the mess his home life has become.

Alice is getting a little lonely but it doesn't take her long to meet mum-chum Julie. What dark secret is her useless husband Colin hiding?

Alice, Mitch & Richie decide to get Lily’s photo taken – a beautiful family portrait to capture this exciting new phase of their lives. However, on their way to the photographers Alice makes an enemy of the pedantic and punctilious security guard Mr Scrutton (Bill Bailey) and the day descends into chaos when Scrutton detains the trio for shoplifting and Alice makes the worst mistake a new mother can.

Richie's real dad unexpectedly shows up, leading our threesome into a complicated web of lies. Throw Richie's ex, Sandwich Harry, into the mix and sparks will fly!

Alice and Mitch have finally decided to get married. There's only one problem...