Stranded on Honeymoon Island
9pm, BBC One
Davina McCall plays matchmaker in a dating series that isn’t a million miles away from Married at First Sight, except the pairs hook up at a speed-dating event and are sent to a tropical island with basic supplies and a composting loo (“I’ve never had ‘the poo chat’ with a man!” squirms one bride). We meet the first three couples – a refreshingly diverse mix of people with “sheer blind optimism” – and it all goes well until a bombshell drops. Hollie Richardson
The Lost Neanderthals
8pm, BBC Four
It is amazing what a tooth can tell you. That is one of the main takeaways from this absorbing film about the Mandrin Cave in southern France, a natural shelter for humans since prehistoric times. The archaeological treasure trove is where the remains of a Neanderthal nicknamed Thorin were uncovered, revealing details about what life was like 50,000 years ago. Graeme Virtue
Nazis, U-boats and the Battle for the Atlantic
9pm, BBC Two
The first in a two-part documentary about one of the second world war’s most crucial campaigns features vivid footage of deep-sea wrecks off the coast of Ireland. We also hear from David Brew – he sadly grew up knowing little about his father, whose Royal Navy ship was torpedoed by a Nazi sub. Hannah J Davies
Long Lost Family: The Mother and Baby Home Scandal
9pm, ITV1
Jean was sent to the Home of the Good Shepherd in Surrey when she was 16 – just one of the unmarried mothers caught in the scandal of mother and baby homes. Now she is looking for her long-lost daughter in a two-parter that will unlock the deepest emotions. HR
Mudtown
9pm, U&Alibi
The intensity ramps up in this drama about a magistrate, Claire (Erin Richards), who deals with a case too close to home. When her friend Beca (Lauren Morais) brings her son, Sonny (Lloyd Meredith), over for dinner, Claire reconsiders his involvement in the recent shooting. HR
Limbs in the Loch: Catching a Killer
10pm, BBC Two
William Beggs was a “very normal, very engaging, very charming” member of the Young Conservatives. He also harboured dark thoughts and fantasies – and had a shadowy, horrific past. When teenager Barry Wallace was found dismembered and dumped in Loch Lomond in 1999, Beggs was the prime suspect but he had vanished. This deeply disturbing true-crime account continues. Ali Catterall