Terrestrial
Britain's Drowned World: A Time Team Special Channel 4, 9pm
Eight thousand years ago, Britain wasn't an island but a part of continental Europe. Tony Robinson and chums piece together the story of the vast lands lost when the North Sea and the English Channel were formed in a huge 1,000-year flood.

Life Line BBC1, 9pm
Joanne Whalley and Ray Stevenson star in a two-part supernatural love-story thriller. Successful entrepreneur Peter Brisco leads an affluent but soulless life, having broken up with Katy Adair, his one true love, 15 years earlier. Back in London for his brother's wedding, Peter catches a glimpse of Katy, and, determined to make up for lost time, decides to engineer a chance meeting.

Long since settled with partner Jack and enjoying a successful career, Katy is pleased to see Peter and agrees to meet for dinner. Over their meal, however, Katy reveals her dissatisfaction with her relationship. Deep down, she still feels exactly the same about Peter - and they embark upon a mad, passionate, but ultimately doomed love affair.

Sex on Trial: The Soapstar Story Channel 4, 10.30pm
Gillian Taylforth - aka Kathy Beale in EastEnders - sued The Sun for libel after it alleged she'd lustily romped in a Range Rover with boyfriend Geoff Knights. The ensuing courtroom shenanigans constituted a head-on collision between celebrity and the legal world that produced more tabloid storylines, more drama, as many tears and as much laughter as any soap.

Digital
I, Robot Film4, 9pm
Set three decades into the future, Alex Proyas's all-action sci-fi film is inspired by Isaac Asimov's famed short story. The science of robotics has grown so advanced that humanoid-looking servants have been developed, ready to obey any human command. When the chief designer of US Robotics, the biggest manufacturer of this new brand, is found dead in the company's atrium, it has all the hallmarks of suicide. Chicago cop Del Spooner (Will Smith) is assigned to the case; he's a technophobe and doesn't believe that all robots are harmless. Despite opposition, he investigates further and soon his suspicions centre on one metal critter, Sonny (voiced by Alan Tudyk). Is he one of an army of malevolo-bots ready to challenge the humans?

Secret Life More 4, 10pm A repeat of the grimly powerful drama that questions the lack of effective measures to prevent convicted child sex offenders from re-offending after prison. Matthew Macfadyen plays Charlie, a child sex offender who has served his prison sentence but, by his own admission, continues to pose a significant danger.

Radio
Make 'Em Laugh, Make 'Em Laugh Radio 2, 10.30pm
That very amusing chap Rob Bryden knows more than a thing or two about sitcoms, but how many of us acknowledge that when we're falling about at Only Fools and Horses or The Simpsons, we're often laughing at ourselves? Bryden presents some evidence in this trawl through sitcoms as a reflection of their particular times. First of three programmes.