Diana: Her Last Summer 9pm, Channel 5
She looked a million dollars and had the compassion of a nun. So says Sun photographer Arthur Edwards, summing up the winning, fateful combination of assets that made Diana, Princess of Wales clickbait before the term was invented. The first of a series of documentaries about her life, this film explores the tumult of the months before her death. Presentationally, its a melodramatic affair but it is grimly fascinating to be reminded of the hyperspeed relentlessness of the press attention that preceded Dianas death. Phil Harrison
This weeks real-life story of a missing person focuses on the former soldier Mark Smith, who suffers from PTSD and hasnt been seen for 24 hours since arguing with his wife. Smith, the founder of a veterans charity, has been behaving erratically for weeks and has made alarming social media posts. Hannah Verdier
This rambunctious drama was a hit for ITV Encore in 2017 and has been snapped up by the BBC to fill a Covid-shaped hole in the schedules. Its heady, bawdy fun and worth a look if you missed it the first time round. Tonight, Lucy (Eloise Smyth) is hired by Lord and Lady Repton, but is slightly disconcerted by their tastes. PH
Doctor and pop-science provocateur Mosley has always had a way with an eye-catching premise and if weight loss after lockdown is your concern, this might be helpful. Volunteers will be coping with high-intensity workouts and low-calorie diets in an attempt to shed weight fast. PH
Joe Simpson is best known for his ordeal in the docudrama Touching the Void. But his father had a storied life too, fighting behind Japanese lines in the second world war. In this series, Simpson travels to Myanmar to retrace his fathers footsteps and get a measure of his experiences. PH
A fast, funny doc about the fashion brand Missguided and the young women who dominate its workforce. Tonight, the hunt is on to sign up a hot Love Islander, while a YouTuber does her first shoot. The narration has its own style: Oh no! Shit! Theyre going to the wrong location! Jack Seale
Her (Spike Jonze, 2013) 1.55am, Channel 4 In a near-future LA, Joaquin Phoenix is the lonely Theodore Twombly who, while breaking up with his wife (Rooney Mara), falls for his Scarlett Johansson-voiced computer operating system the seductive Samantha. Jonzes sci-fi romance is a wry, thoughtful satire on the absurd possibilities of human/IT interaction. Paul Howlett
Snooker: The World Championship,1pm, BBC Two The opening semi-final at the Crucible Theatre in Sheffield.
Scottish Premiership football: St Mirren v Celtic, 5pm, Sky Sports Main Event From Simple Digital Arena.
Champions League football, Atalanta v Paris Saint-Germain7pm, BT Sport 1 From Estdio da Luz.
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TV tonight: the last, tumultuous days of Diana - The Guardian