Here are the picks of tonight's TV...

Sinking Cities: London, C5, 8pm

PROTESTERS have been taking to London’s streets to draw attention to climate change. This documentary looks at how for decades, Londoners have put their faith in the Thames Barrier to keep them safe. However, it is now under increasing pressure due to three major environmental challenges – rainfall has increased by 20% in the past decade, sea levels are also rising, and the city has developed along a floodplain. This documentary looks at what is being done to tackle the problem, and also hears from the architects who believe that the future of our cities lies in amphibious dwellings.

Bake Off: The Professionals, C4, 8pm

LIAM Charles and Tom Allen present as one of Britain’s toughest patisserie competitions continues. This time the remaining teams must make pristine, perfect cheesecake slices and pear-shaped desserts. For the second challenge, contestants must create a themed piece montee with two flavours of choux buns – for 60 people, in only five hours. Cherish Finden and Benoit Blin will be passing judgment on who is the weakest baker.

Years and Years, BBC1, 9pm

STEPHEN and Celeste try to rebuild their shattered lives, but Daniel’s world turns to terror when Viktor has to flee Kiev. Rosie loses her job, while Edith’s former life as an activist calls her back into action on a secret mission. The Lyons children are united when they discover that their long-absent father, Vincent, has died. They attend the funeral and face many home truths, on the day of the General Election that sees Viv Rook rising to power.

Murdered By My Stalker, C5, 10pm

A NEW series of true-crime documentaries begins with the story of a 24-year-old woman whose soldier ex-boyfriend became obsessed with her after she called off the relationship. Alice Ruggles, a Northumbria University product design graduate originally from Leicester, repeatedly called police over Trimaan Dhillon’s stalking campaign after he “bombarded” her with text messages and phone calls and showed up at her flat. She was later murdered at his hands. Dhillon was jailed for life with a minimum of 22 years for the act of “utter barbarism”.