Inventing the Impossible, The Big Life Fix is on BBC Two at 8pm.

A team of designers help create a monitoring solution for a four-year-old with a rare form of epilepsy, and try to help a 19-year-old with cerebral palsy take control of a boat.

Keeping Faith is on BBC One at 9pm.

Fourth part of the drama. The lawyer is forced to take shelter in a hotel after learning that Evan may have had a connection to a drug-dealing family.

The Prosecutors is on BBC Two at 9pm.

Return of the documentary series. The Crown Prosecution Service, and West Mercia Police, tackle a gang that are flying illegal drugs into prisons using drones. Concludes next week.

Meet the Drug Lords, Inside the Real Narcos is on Channel Four at 9pm.

Three-part documentary in which Jason Fox investigates how South American drug cartels operate. Tonight, he begins in Mexico, where he meets members of the Sinaloa drug cartel.

Evil Monkeys is on ITV2 at 9pm.

Comedy game show in which celebrities take on a series of challenges on an island ruled by apes. Towie stars Bobby Norris, James Lock and Yazmin Oukhellou take part tonight.

Eamonn and Ruth, How the Other Half Live is on Channel 5 at 8pm.

Ruth Langsford and Eamonn Holmes explore how to make lots of money, meeting Ann Summers boss Jacqueline Gold and millionaire philanthropist Jack Petchey along the way.

Cuckoo is on BBC Three Online from 10am.

The complete fourth series of the comedy, starring Greg Davies and Taylor Lautner, is available to watch online from today, using the BBC iplayer.