TV Times top picks for tonight

What’s on telly tonight? Here the TV Times team of expert reviewers highlight the best shows on Tuesday 20th November

Informer, 9pm, BBC1

The secret undercover activities of reluctant counterterrorism informer Raza (Nabhaan Rizwan) have devastating consequences for his family in this excellent drama’s final episode. Raza’s own life is in danger when, to the horror of his police handler Gabe (Paddy Considine), Raza’s successful infiltration of the east London terrorist cell brings him much closer to the terrorism mastermind than anyone had envisaged. And finally at the inquest into the mass shooting at Café 66, which opened the series in breathtaking style, the shocking identity of the shooter is at last revealed – and the lives of everyone involved are changed for ever. Rating: ****

MasterChef: The Professionals, 8pm, BBC2

With the knockout rounds next week, there are two heats to go – tonight and tomorrow – with 12 chefs hoping to make it through to Thursday’s quarter-final where we’ll see who progresses to the semis. In each heat, the chefs have to cook dishes chosen by judges Monica Galetti and Marcus Wareing before trying to impress them, and Gregg Wallace, with their signature dish. Those who make it through to the quarter-final face the Judges’ Favourite Ingredient Test, where they have to think of sensational ways to use vanilla, before cooking a two-course meal for food critics Grace Dent, Jay Rayner and Tom Parker-Bowles. Rating: ***

Impossible Engineering, 8pm, Yesterday

The fascinating series about modern engineering marvels returns with a look at Chernobyl’s New Safe Confinement. A massive concrete structure was hastily built in 1986 after the nuclear disaster occurred, in an effort to contain the remains of a damaged reactor and halt the spreading of the deadly radioactive material. Now this structure is failing, so an international team have built the world’s largest moveable structure to not only house the dangerous reactor but also help dismantle it, which could take over 100 years. The huge team were faced with almost impossible obstacles, and turned to groundbreaking pioneers of the past to solve the issues and save Europe from another nuclear disaster. Rating: ****

More previews tomorrow.