Britain’s Child Drug Runners
10pm, Channel 4
“County lines” drug dealing involves gangs from big cities expanding their operations into towns and villages. This often includes coercive exploitation, which can range from occupying the homes of the vulnerable to grooming very young children to sell drugs. This documentary gains remarkable levels of access to young people involved, often reluctantly, in this grim trade and follows police, parents and social workers as they attempt to find solutions. Phil Harrison
The Apprentice
9pm, BBC One
After last week’s literal rollercoaster, Lord Sugar’s surviving cadre of 10 self-involved jargonauts are tasked with rebranding an entire country. Will they be able to shoot a television ad and plan a billboard campaign in the usual absurdly tight time frame? Or will it be a clash of egos from start to Finnish? Graeme Virtue
Doc Martin
9pm, ITV
The latest series of this contented yawn of a show comes to an end. Morwenna and Al are getting married but, this being a wedding in a TV drama, inevitably there are a few hitches. Meanwhile, Martin is sidetracked by an emergency when he should be working on his GMC assessment. Never knowingly over-dramatic, always entirely likable. PH
Grand Designs: House of the Year
9pm, Channel 4
After a protracted wander around the eco-barns, revamped shipping containers and repurposed water-towers of Britain, we have a winner as Kevin McCloud reveals his house of the year. Contenders include a home made from exposed concrete and a timber wedge house in an arboretum. PH
Britain’s Lost Masterpieces
9pm, BBC Four
Art investigators Emma Dabiri and Bendor Grosvenor begin this week’s mission in the National Museum Cardiff, where they meet a Madonna that could be from Botticelli’s workshop. Dabiri also investigates the wealthy sisters who donated to the museum. Hannah Verdier
In the Long Run
10pm, Sky One
As Melissa’s adoption party gears up, Bagpipes (Bill Bailey) is starting to think his estranged parents “might be a little bit racist” – which a visit to them with Walter may or may not confirm (“Would you like me to see if next door has a can of Lilt?” asks Mum). Great fun, great 80s soundtrack, too. Ali Catterall
Film choice
Hanna, 9pm, Sony Movies
Like Jason Bourne, except the assassin is a hit-girl: 16-year-old Hanna (Saoirse Ronan), is brought up by her ex-secret agent dad (Eric Bana) in remote Lapland and taught all the ruthless skills she needs when nasty Cate Blanchett turns up. Joe Wright brings quirky genre changes without stinting on the action. Paul Howlett
Live sport
Tennis: ATP World Tour Finals 2pm, BBC Two. Day four from the O2, featuring a singles round-robin match.
Grand Slam Darts 7pm, Sky Sports Main Event. Coverage of second-round matches on day five.
Basketball: Los Angeles Clippers v Golden State Warriors 3am, Sky Sports Main Event. NBA Western Conference match from Staples Centre.
