PICK OF THE DAY

Line Of Duty

9PM, BBC1

Taking her children out of the equation (surely?), is there anyone DCI Roz Huntley won’t try to frame as we reach the finale of the fourth series? With Nick in custody and facing intensive questioning over Tim Ifield’s murder, she turns the screw further, with devastating results for her beleaguered husband. But is it too soon for Roz to rest on her laurels? Meanwhile, as AC-12 doggedly continue their quest, Hastings is more determined than ever to nail his quarry (‘the wee witch’). Compelling? Certainly. Over the top? Probably. Unmissable? Absolutely.

Escape To Costa Rica

7PM, CH4

Costa Rica has no military, and powers its national grid with rivers and volcanoes. Home to more than 500,000 species, its rainforest is growing, rather than shrinking. In this threepart series, science writer and explorer Gaia Vince investigates how this little republic became the world’s ‘happiest and most sustainable’ country.

The Durrells

8PM, ITV

When Leslie (‘of all people’) points out that Larry is crestfallen by his mother’s lack of interest in his novel, and Gerry’s increasingly feral behaviour has her fretting that ‘he literally wants to turn into an animal’, Louisa decides to adopt a new style of parenting in episode two of this delightful series. Can Theo help?

Grantchester

9PM, ITV

This week, a village cricket match on an idyllic summer’s day takes a dark turn when the players start dropping like flies at the post-match buffet. When young Pakistani batsman Zafar Ali fails to recover, Geordie and Sidney find themselves knee-deep in racial tension, secret affairs, power games – and poison. SH