BBC Four, 9.00pm A tale of intrigue, romance and betrayal unfolds in this succinct and smartly portrayed two-part adaptation of Alan Furst's Spies of Warsaw by old hands Dick Clement and Ian La Frenais. At times it feels a little static but it ticks the boxes for looking authentic - albeit in small-scale fashion but then BBC Four have become masters of this type of production - as French and German spies seek to gain the upper hand on the streets of a wary pre-World War II Warsaw. David Tennant (right) plays Colonel Jean-François Mercier, a decorated war hero who juggles his buttoned-up diplomatic duties with a far more exciting role as an espionage agent suspicious of Nazi intentions and manoeuvres on the Polish border. And with the help from a German informant, his suspicions are soon confirmed - putting his life in danger. Against the backdrop of a city on the edge, the suave Mercier also becomes involved with a foxy Parisian lawyer, Anna Skarbek (Janet Montgomery), who is herself involved with the shifty Marek (Miroslaw Zbrojewicz), a Russian émigré and Left-wing journalist. It's a relationship that threatens to jeopardise an already hazardous mission. Part two is next Wednesday. Heir Hunters BBC Two, 7.00pm Once a week, the Government releases a list of unclaimed private estates. Off scurry "heir hunters," in search of people who could loosely lay claim to a share of the wealth. Presented by Lisa Faulkner, tonight's televised attempt to get one over on the Treasury follows the case of Rita Mason, who died in 2010. The research team thinks there could be a windfall of £175,000 for one lucky relative. Live Capital One Cup: Chelsea v Swansea City Sky Sports 1/SSHD1, 7.00pm Chelsea, having won 5-1 at Southampton on Saturday in the FA Cup, now turn their attention to the Capital One Cup, with this first-leg semi-final tie against Swansea at Stamford Bridge. The last time Swansea, who defeated Middlesbrough in the previous round, played here, in September 2011, two goals from Brazilian midfielder Ramires inspired Chelsea to a 4-1 victory. The Food Inspectors BBC One, 8.00pm Food hygiene makes for compelling TV: what better way to churn the nation's stomachs than by broadcasting footage of a cockroach in a chow mein, or a footprint in some feta. But this returning series aims to "protect the nation from poisonous food"; tonight Matt Allwright and Chris Hollins are investigating family meal times - apparently most cases of food poisoning happen at home. They'll also be having a nose around a questionable Indian restaurant. David Attenborough and his team continue their travels for this epic-scale documentary, heading to the steamy swamps, boundless savannah and snowy peaks of East Africa. The photography alone only serves as yet another reminder that, when it comes to nature documentaries, the BBC are the best in the world. Tonight they're in Tanzania, where Attenborough introduces us to a plucky lizard that risks its life every day to feast on flies found on lions" faces, and the nesting habits of the 4ft shoebill - a bizarre, prehistoric-looking bird. Growing Up Poor BBC Three, 9.00pm Whereas some cope with the double-dip recession by only taking one holiday per year and reducing the hours of the cleaner, a section of Britain's teenagers are facing far harsher circumstances. Made by the team that produced Poor Kids, this striking documentary follows three very different teenage girls who are all surviving on a tenner a day (part two next week deals with three boys facing the same pressure). Bridie hopes to join the Army and is trying to stay out of trouble with the police; Amber is pregnant and finding it hard to make ends meet; and Shelby is on a work placement. The fascinating fly-on-the-wall series about the maternity ward at Leeds General Infirmary finds two first-time mothers giving birth. First we meet tattooed heavy metal fan Sam, 23, who, after some rebellious teenage years, met her long-haired boyfriend at the ice-skating rink. Next is 20-year-old Claire, who broke up with the father-to-be during the pregnancy. Will she want him present at the birth? World's Most Dangerous Roads BBC Two, 9.30pm Marcus Brigstocke and Phill Jupitus head to Bolivia for an alarming high-altitude trip along the Yungas Road - or "Death Road," on which it's estimated that 200 to 300 travellers are killed every year. They also have to navigate the spectacular Salar de Uyuni, a salt lake so vast that Neil Armstrong and Buzz Aldrin reported they could see it from the moon. On the Verge of a Midlife Crisis with Sharon Horgan A midlife crisis is a cliché, until you have one. So says Irish comedian Sharon Horgan, who claims to be "pre-crisis," and is using this documentary to work out the best way to deal with her impending middle age. The six women we are introduced to aren't tackling their crisis with HRT and Valium, but with "sex, sperm donors and tattoos." We meet 48-year-old Leila who wants a baby but doesn't have a man so is giving artificial insemination a try. Next up it's Sharon, who "isn't a cougar," but loves dating younger men. Then there's Bea, who has dealt with her crisis head on. She's had all manner of elixirs injected into her face, but is now unable to smile. Horgan concludes this mystifying lifestyle research by proclaiming "a fully blown midlife crisis is the way forward." I think I'd rather have the Valium. BBC One, 11.50pm Claudia Winkleman presents a roundup of recent films, including Tom Hooper's "heart-soaring" adaptation of Les Misérables. Danny Leigh talks to violence-loving director Quentin Tarantino about his film Django Unchained, and there's a look at Irish drama What Richard Did.