TV Guide BBC Two Thursday

When the circumstances of a crime novelist's death eerily mirror the details of his final novel, Humphrey must uncover whether it was a coincidence or murder by design. The Lily Bond is caught adrift leaving Humphrey and Martha back home with Anne. Crime drama, starring Kris Marshall

Chaquie helps Rachel get ready for an important event for Anna. On the way, Celine and Rachel stop by the Walsh house - only to discover Anna is missing. Claire drops Kate off to James, but their tense exchange leaves her questioning how their co-parenting arrangement is working. Also, after an argument between the sisters, a quiet moment of unity pulls them back together

Roman Kemp suggests a 'reverse-moves' approach to exercise, including walking downhill instead of up and lowering weights instead of lifting them, both of which could have significant health benefits

Monty Don is busy with spring and planning ahead for summer. He's doing a seed-sowing masterclass, cutting back Cornus and dividing ferns to put in the new Woodland Garden. Frances Tophill is exploring the tiny but expansive world of miniature daffodils at a nursery with hundreds of cultivars. And in Llanelli, Sue Kent meets a gardener who has set up her own seed library, helping to preserve varieties of flowers and edibles which flourish in local Welsh soil and beyond

Clive visits Bologna, considered by many to be Italy's food capital, where he leans to make perfect pasta and finds out why an osteria - an Italian wine bar - is superior to a pub. But it's not all food and drink as he also dons his hard hat and climbs some scaffolding to learn the history of an 800-year-old tower

Zoologist George McGavin concludes his exploration of the primate world, considering their capacity to use tools and solve problems, something he claims sets them apart from most other families on the planet. By way of demonstration, the presenter goes to orang-utan school in Sumatra, visits Thailand to see long-tailed macaques floss their teeth with human hair and use tools to open oysters on the beach, and reveals how Ugandan chimpanzees pass on cultures and customs down the generations. He also meets a resourceful bonobo in the States that can order its own picnic on the phone and build a fire, on which it then toasts marshmallows

The experts make a return visit to Eastnor Castle in Herefordshire, where they value a 17th-century wine bottle and a collection of letters, photographs and medals belonging to three suffragettes from Glasgow. Among the other treasures are a Victorian dressing case which, despite having travelled from England to Brazil and Guernsey, remains in pristine condition. Presented by Michael Aspel

An ale jug and an unusual gold scarab are among the items examined by Tracy Martin and Charlie Ross at the Sheldonian Theatre in Oxford. Presenter Paul Martin visits the drawing and print room at the Ashmolean Museum

Documentary looking at four of Britain's 15 national parks, capturing the sights and sounds of these unique places and meeting the people who live and work there. The opening edition visits the New Forest, once a royal hunting ground for William the Conqueror and now a mosaic of open heathlands, ancient woodlands, coastline and picturesque villages. The park is home to ponies, deer, rare bird species and reptiles, while the traditional grazing practices of generations of commoners sustain this landscape, with their ponies and pigs roaming freely throughout the park

The three talented chefs from Northern Ireland are halfway through their heat, and the pressure is mounting. Once again, they each serve a unique take on the brief celebrating the British film industry and films with links to Northern Ireland. The dishes are judged by veteran judges Jean Delport and Sally Abe, and include a roast chicken inspired by Kenneth Branagh's adaptation of Murder on the Orient Express, as well two desserts inspired by the film Good Vibrations

Mary prepares for her official debut in London society, buoyed by her friendship with Ann and the attentions of Mr Ryder. But a run-in with her old rival Caroline Bingley threatens her growing confidence. Mary faces up to her old rival at a dinner party, while an urgent message from home throws everything into uncertainty

Mary rushes to Pemberley, fearing her mother is gravely ill, only to be thrown back into the demands of family life. She begins to lose hope of ever returning to London, until Mr Ryder unexpectedly turns up. His clear admiration for Mary helps the family to recognise how much she has changed. As excitement mounts over Mr Ryder's visit, Mary finds herself on the brink of a momentous decision