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 18th September

The Great British Bake Off, 8pm, C4

It’s Desserts Week tonight, and while that may sound like a broad theme, Paul and Prue are more exacting than ever. The signature challenge is a tricky meringue roulade that demands concentration and calm, while the 1970s-inspired technical is a nightmare to make during a heatwave. But it’s the ambitious showstopper that really, erm, stops the show: the bakers must create a mouth-watering dessert concealed within a chocolate globe, only revealed when a yummy hot sauce is poured over the top. With challenges like this in week four we can’t wait to see what they’ll be making by the time we reach the final! Rating: *****

Princess Margaret: The Rebel Royal, 9pm, BBC2

The final part of this intimate portrait of the Queen’s late sister turns the spotlight on Princess Margaret’s party-girl reputation as she and her new husband, Antony Armstrong-Jones, embraced the Swinging Sixties and socialised with celebrities and artists alike. After the marriage broke down in the early 1970s, Margaret continued her partying on the Caribbean island of Mustique, with her extravagant lifestyle and relationships coming under scrutiny from the press at a time when Britain was in economic crisis. But with her divorce from Armstrong-Jones in 1978, in her own way, this rebel Royal paved the way for the modernisation of the Royal Family. Rating: ******

Wanderlust, 9pm, BBC1

After an awkward nightclub encounter, Joy and Alan decide to tell their children about their open relationship. The kids take it pretty well, but things get complicated when Joy’s old flame (Paul Kaye) arrives on the scene. But never mind all that, because the relationship we’re most interested in is the slow burn between the couple’s daughter Naomi and their neighbour Rita (a wonderfully subtle and nuanced Anastasia Hille). Rating: ****

More previews tomorrow.