Pick of the day.
How We Built Britain (9.00pm)
David Dimbleby completes his journey through Britain, tracing the arrival of the bold new Modernist style at a public swimming pool. 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. Ray Stevenson and Michael Nardone star.
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. Jonny Phillips guests.
Big Brother: On the Couch (8.00pm)
Davina McCall is joined by a team of experts to analyse the psychological effects of being in the most watched house in Britain.
Senator Collins receives chilling news about his missing wife. Meanwhile, Agent Kelton disobeys orders as the search for the truth becomes even more desperate. John Allen Nelson stars.
You've Got Mail (Sky One, 9.00pm)
Two lonely executives fall in love over the Internet, little realising they not only know each other, but are also business rivals. However, their fledgling relationship struggles to survive once their identities are revealed. Warm and fuzzy but somewhat flat romantic comedy, starring Tom Hanks, Meg Ryan, Greg Kinnear, Parker Posey, Dabney Coleman, Steve Zahn, Dave Chappelle and Heather Burns