Radio Times review

The Brockman household is rich in theories in this episode. Jake and Ben try out some of their ideas about human behaviour, and Karen continues following the cold, take-no-prisoners, 11-year-old logic that is putting her classmates off her. At swimming, she's graduated from sweet little kids' races to hardcore heats with sledging, instigated by her, at the poolside. Meanwhile, Pete is getting involved in his own inter-parental dispute with Fred out of Call the Midwife (aka Cliff Parisi).

Not surprisingly, now that the cast is older, this final series is calmer than previous ones, with the domestic chaos swapped for something closer to gentle unrest. But Ben can still be relied upon for some boyish levity, which this week comes from twin obsessions: psychology and Spartacus. He's got a net and he's not afraid to use it.