TV tonight: endless laughter with Sandi Toksvig and Sarah Millican

Extraordinary Escapes With Sandi Toksvig

9pm, Channel 4

Is there anything more wholesome on TV than this hour of Sandi Toksvig and Sarah Millican escaping to Devon for a weekend together? “I’ve never met anybody who, as part of their job, needs to see if something is ‘uddering up’,” Toksvig tells her companion about the ranger looking after ponies. Cue infectious laugher – which runs throughout the episode as they chatter and chill out. Future travel guests include Sara Pascoe, Sue Johnston and Philippa Perry. Hollie Richardson

Dragons’ Den

8pm, BBC One

The welcome green theme continues, with two hopefuls pitching a solution to plastic bags – but does it actually work? Elsewhere, an awkward moment for anyone who has ever slipped up over someone’s name. HR

The Dog House

8pm, Channel 4

Poppy and Bron are two pups that hope never to be separated – but how easily can they find a home that will welcome them both? Meanwhile, Harry the saluki is a bag of nerves, which will make you fall in love with him all the more. Let the dog/owner matchmaking continue. HR

Caroline: The Murder That Fooled the World

9pm, Channel 5

The story of a young British mother who was killed in Greece had all the ingredients it needed to captivate tabloidesque imaginations. This documentary errs on the right side of salacious as it delves into the investigation of Caroline Crouch’s death, drawing on interviews with experts and the people closest to her. Hannah Verdier

The Fear Index

9pm, Sky Atlantic

“Humans act in very predictable ways when they’re frightened.” This is the premise of this pacy Robert Harris adaptation, starring Josh Hartnett as a mathematical genius whose investment strategy uses advanced risk assessment to make a killing. Tonight, a plane crash leads to vast profits – and unwelcome attention. Phil Harrison

First Dates

10pm, Channel 4

In the spirit of Valentine’s week, pay a visit to the romantic restaurant where 73-year-old adventure addict Mike meets fitness fanatic Coleen, and forever-single Sophie is hoping to meet a nice guy who will commit (good luck with that). HR