The award-winning comedy returns, as Gran takes the Brockman family for a day's sightseeing in London. Karen is unimpressed with modern art, Jake suffers serious trauma when he is unable to text, and one of the family uses a visit to HMS Belfast for a brief re-enactment of the Second World War.

Karen recreates Britain's Got Talent, Ben takes a close interest in Dad's medical tests and Mum thinks Jake's healthy interest in girls is becoming unhealthy. Meanwhile, the ghost of John McEnroe hovers over Dad's Saturday morning game of tennis. Karen decides to sort things out.