Tonight's TV highlights

Too Fast To Be A Woman? 7pm, BBC2 When South African runner Caster Semenya won the women's 800m at the 2009 World Championships, she must have anticipated attention. She can't have imagined that hers would become, if briefly, the most discussed sporting identity on the planet, as doubts of varying credibility and delicacy were raised about her gender. This documentary chronicles the scientific, legal and political brawl prompted by Semenya's triumph – and reminds us that, at the heart of it all, a clearly gifted and dedicated athlete is left wondering if she'll be allowed to compete again. Andrew Mueller Silk 9pm, BBC1 When Maxine Peake's brassy barrister, Martha Costello, scrawls "NG" (not guilty) on a case file in lipstick, you get a sinking suspicion of where this is heading: woman in a traditionally male profession going against the grain. As a defence lawyer, Martha has a complex morality to explore, but it's handled with all the dexterity of a gavel walloping down on the block. Peake is good, but there isn't a lot she can do with the hoary old plot or lines like "innocent until proven guilty – four words to live by". A shame. Rebecca Nicholson Heston's Mission Impossible 9pm, Channel 4 Heston Blumenthal flies to the rescue of four institutions that have very different and difficult challenges when it comes to food: British Airways, the NHS, the Royal Navy and Cineworld Cinemas. He starts with Alder Hey children's hospital, where the sick children generally hate the food. The script is familiar – the staff are sceptical of the celeb chef parachuting in, while the three-star Michelin man amazes all with his wizardry and food science. Martin Skegg True Stories: My Kidnapper 10pm, More4 Mark Henderson was one of a group of tourists kidnapped in Colombia in 2003 by a Marxist guerrilla group. Bizarrely, almost a year after his release, he received an email from one of his kidnappers. After five years of correspondence, Mark (together with three fellow hostages) returns to Colombia to revisit his days in captivity and meet with his captor. The film suffers from being feature length – you wonder what Werner Herzog would have done with this material in half an hour – and the intensely personal nature is at times distancing rather than engaging. MS Hot In Cleveland 8.30pm, Sky Living The ladies are still in Cleveland after their plane crash, and Melanie (Valerie Bertinelli) is so enamoured with cheap and cheerful Ohio that she considers putting her LA house on the market. Bizarrely, this entire episode hinges on a strange "Is he my son or my boyfriend?" story arc for Jane Leeves's "self-hating cougar", but there's light relief, of a fashion, from Betty White's wise-cracking 88-year-old flirt trying to get a date with one of a number of suitors before they kick the bucket. It's a funny old show, not always in the way the makers intended. RN Junior Doctors: Your Life In Their Hands 9pm, BBC3 Friday night binge drinkers, cardiac arrests and lost pens: there's always a lot to take in when it's your first day in a new job – but it's even more stressful when you're a newly qualified junior doctor (even more so when you've got a TV crew watching). Over the next six weeks, this new series will follow seven medics as they learn the ropes in the busy A&E, gastro, paediatrics and plastic surgery departments at the Royal Victoria Infirmary and The General, Newcastle upon Tyne. Richard Vine