Today's TV picks

Inventing the Impossible: The Big Life Fix (BBC2, 8pm)

AS this ever engaging second series comes to a close, designers Zoe Laughlin and Ryan White investigate whether there is anything they can do to help 11-year-old Malachi. He has Tourette's syndrome and ADHD, so his tics and behavioural issues can make life a misery. There's an equally touching attempt to get a four-year-old, who is paralysed from the waist down, walking again. Plus, the team hopes to assist a quadriplegic man who wants to use his mobile and credit card on the high street without having to ask for help.

Searching for Mum: Sri Lanka (BBC2, 9pm)

WHO Do You Think You Are? and Long Lost Family tap into that basic need we all have: to know more about our culture and our roots. This new two-parter should prove just as moving as those ratings-winners. Two women - both adopted as babies - return to Sri Lanka to try to find their birth families. Rebecca, 38, was adopted from Sri Lanka when she was three months old, by a Sri Lankan couple living in London. For the first nine years of her life, Rebecca thought her adoptive family was her birth family. One evening she found her adoption papers by accident. Since then she has been trying to find the truth about the family who brought her into the world. Cameras also follow Ria, 27, who was adopted by a couple living in northern Scotland. She always wondered what her life would have been if she had stayed in Sri Lanka - and what happened to her mother. Hopefully now she'll get some answers.

Celebrity Big Brother: Live Launch (Channel 5, 9pm)

FROM the Jack Dee-winning opening series in 2001, through the notorious Shilpa Shetty affair in 2007, Celebrity Big Brother was a rollercoaster ride of fun and controversy. By Ulrika Jonsson's victory in 2009, many had enough, and when it went to Channel 5, it seemed there was even less reason to tune in. However, when chirpy, chatty Emma Willis took over from Brian Dowling, the show received a welcome boost. It didn't hurt that a spin-off show with Rylan Clark-Neal helped improve the brand no end. Now the whole thing kicks off again, and if this launch show leaves you hungry for answers (like who are these alleged celebs?), then all will be revealed in the spin-off show straight after.

Keeping Faith (BBC1, 9pm)

WHEN Evan's car is found abandoned at the docks, the police take Faith down to the station for another interview - and although Steve tries to help, he too finds himself facing the long arm of the law. An increasingly conflicted Tom uncovers terrible secrets about his son, Bethan's erratic behaviour puts strain on her marriage and Faith prepares to do a secret deal with Dr Alpay. Thriller about a lawyer's search for her missing husband, starring Eve Myles, Mark Lewis Jones, Aneirin Hughes and Mali Harries.

Meet the Drug Lords: Inside the Real Narcos (Channel 4, 9pm)

JASON FOX travels to Peru to conclude his investigation into the South American drug cartels. He heads for a remote spot in the foothills of the Andes known as Cocaine Valley, where hundreds of tons of the drug are produced each year. Here he meets one of the valley's most renowned cocaine chefs, who works in a hidden, pop-up lab. The presenter also joins young drug carriers on a dangerous trek out of Cocaine Valley and accompanies an elite helicopter police unit on a raid to destroy a jungle lab. Last in the series.

The Detectives: The Farmhouse Robbery (ITV, 9pm)

DOCUMENTARY focusing on the work of Lancashire Police's major investigation team, from the same producers that made award-winning 2016 film The Murder of Sadie Hartley and its follow-up series The Detectives: Inside the Major Crimes Team. Detectives look into an armed robbery at a remote farmhouse where the owner was tied up and various items were stolen, including seven hunting rifles and the victim's car. The officers also seek the truth when a baby is severely injured during a shocking incident of domestic violence.