Pick of the day.
How We Built Britain (9.00pm)
David Dimbleby completes his journey through Britain. He traces the arrival of the bold new Modernist style. Last in series.
Pullo faces personal tragedy and Octavian proclaims a new era of virtue in the empire, promising to punish adultery, promiscuity and vice. Zuleikha Robinson stars.
Geoff and Phil bring two suspicious men into the station, but two others escape from the scene and the officers soon find themselves in danger and under siege.
Big Brother: On the Couch
Davina McCall is joined by a team of experts to analyse the psychological effects of the Big Brother house.
Senator Collins receives chilling news about his missing wife. Meanwhile, Agent Kelton disobeys orders as the search for the truth becomes even more desperate.