A preview of upcoming programmes from BBC Two.

From Didcot Railway Centre in Oxfordshire, Eric Knowles explores an array of artefacts, from wonderful whistles to lavish lanterns. He also recalls some railway-related buys from teams down the years and reveals some of the most profitable pieces.

The highlight of Anooshi's garden in Leeds is her pretty and colourful washing line. With £5,000 to spend, she wants a showstopper garden that could win a prize at the Chelsea Flower Show.

Rick rediscovers his love for the foodie heaven of Argyll, where land and loch yield exquisite produce. He meets chef Pamela Brunton, a Michelin Green Star winner, whose menu showcases local and foraged ingredients.

It's all to play for as the week's six best comeback contestants return for the last quarter-final and the chance to push on into Knockout Week. Just one challenge awaits, so the hopefuls will need to go big or risk going home.

Twenty-four hours a day, the latest national and international stories as they break.

Jo Coburn and panel discuss the big issues of the day.

Contestants compete across the series, scoring points by answering questions correctly. However, they must avoid the impossible answers, otherwise they will be eliminated from the show until the next day.

Clive Myrie asks the questions as four more contenders take the black. Specialist subjects are the Blandings stories of PG Wodehouse, Seattle Seahawks, the listed buildings of Liverpool and the music of Beyoncé.

Michael Portillo begins this leg of his Scottish railway journey in the beautiful medieval city of Stirling. Michael learns it was a strategic city, situated where the Lowlands meet the Highlands at the lowest bridging point of the River Forth.

A look at two hybrid animals, the pizzly bear, a cross between a polar bear and a grizzly which has come into being because of global warming, and the killer bee, brought into existence because of the transfer of African bees to South America.

As the Serengeti starts to dry out, competition hots up between the families. The strong females take centre stage, dealing with wayward males and fighting for the survival of their kin. Plus, a new family has moved into the Serengeti: Kike a first-time cheetah mother with three tiny cubs in tow.

Hannah Fry delves into the inner workings of virtual assistants, such as Google Assistant and Siri, which are now found in almost half of all UK homes. Hannah goes behind the scenes with Alexa's chief scientist, reveals how secret technology invented to hunt U-boats led to their targeted hearing, and discovers modern wireless networks' debt to a 1940s Hollywood star.

The show comes from Dover Castle in Kent. Antique experts Catherine Southon and Jonathan Pratt search for items to take off to auction. Catherine falls for a colourful brooch and Jonathan unearths a horn beaker used by Winston Churchill. Paul Martin uncovers the story of Dover Castle's secret tunnels.

Every day this week, previous contestants Sian Gibson, Jean Johansson, Iain Stirling and Rav Wilding take on a series of quiz rounds selected by the host, quiz legend Richard Osman.

Marcus combines the French passions of food and sport to impress some local pétanque players. Along the way, he hunts for the best of an ingredient he knows the French adore: cheese.

Andi Oliver is in Burnley to supersize an annual cricket match between members of the local Mosques and Clergy. Following race riots in 2001, Burnley's imams and vicars have been staging the contest in order to build bridges between communities.

In 2021, Champlain Towers South, an apartment building near Miami, collapsed, killing 98 people. This film examines what happened and asks what went wrong. Emotional eyewitness testimony, tense bodycam footage from first responders, news archive and 3D CGI animations are used to piece together the definitive, moment-by-moment account of this disaster. In Scotland, more than half of all housing is in need of repairs to critical elements, and tenements are crumbling in cities like Glasgow.

It's 1982, and KGB spy Oleg Gordievsky travels to take up a post at the Soviet embassy in London. The spying game and paranoia magnify the suspicion between superpowers, and an arms race threatens to bring the world to nuclear Armageddon.

Late-night passengers get stuck in a tunnel when their train breaks down. Patiently, they wait for the replacement service until a nurse gets her purse stolen and tempers start to fray.

The day's important national and international news stories. With Kirsty Wark.

The latest weather forecast.

John Simpson brings his expertise to bear on the most important stories. In discussion with the BBC's range of experts across the world, he uses their unique local knowledge to go beyond the headlines to get to the unspun truth about the world.

On the North Somerset coast, the Minehead crew come close to disaster in a challenging rescue of two walkers cut off by the tide. Plus, in Dunbar a boy has fallen from some notoriously dangerous rocks and suffered a potentially life-changing injury.

A father-and-son duo pitch their shower cleaning invention, an ex- banker believes she's found the solution to bladder incontinence, a foodie has big plans for her bean brand, and skincare enthusiasts pitch their beauty price comparison app.

The archaeologists complete the excavation of a wealthy residence, a bakery, and a laundry and, in doing so, discover evidence of what people were doing in the city during its final hours.

A preview of upcoming programmes from BBC Two.

Some broken shelves pose a carpentry conundrum for woodworker Sam, and Jacqui Joseph tries to dream up a new look for an old headboard.

Helen and Kevin are nearing full retirement and have a garden dominated by a patio, a breeze-block wall and a shed. With a budget of £4,000, Charlie and Lee have a challenge ahead to craft a coastal oasis despite being a hundred miles from the sea.

Monty expands the planting on the mound, gathers self-sown seedlings and prepares for a summer display in the cottage garden. Meanwhile, Nick Bailey travels to Devon to explore a stunning garden that combines historic charm with modern garden design.

Twenty-four hours a day, the latest national and international stories as they break.

Jo Coburn and panel discuss the big issues of the day.

Contestants compete across the series, scoring points by answering questions correctly. However, they must avoid the impossible answers, otherwise they will be eliminated from the show until the next day.

The specialist subjects are John Cleese, the Alnwick Garden, Marvel's Avengers films and manatees, dugongs and sea cows.

Michael Portillo visits St Andrews, home to Scotland's oldest university, in eastern Fife, before heading to the vibrant city of Dundee and the harbour town of Stonehaven.

Some animals have an extraordinary ability to find their way. The dung beetle, an insect revered by ancient Egyptians, uses the sun, the moon and even the Milky Way to move its prized ball of dung in the right direction.

The incredible anticipation of the annual great migration is being felt by all of the Serengeti's families as they wait with desperation for it to arrive. The land continues to get hotter and hunger start to bite as food becomes ever more scarce for the predators.

Hannah Fry discovers why innovations in meat packing almost derailed the electric car revolution and how a breakthrough in camcorder batteries led to Elon Musk's electric empire, as well as demonstrating how not to drive a multimillion dollar prototype car of the future.

In Blackburn, Anita Manning values a gold charm bracelet, and Philip Serrell takes a shine to an unusual globe. Paul Martin finds about the remarkable life of classical singer Kathleen Ferrier.

Every day this week, previous contestants Sian Gibson, Jean Johansson, Iain Stirling and Rav Wilding take on a series of quiz rounds selected by the host, quiz legend Richard Osman.

Olives have been growing in Provence for thousands of years, and Marcus wants to understand the region's passion for them. Along the way, he meets a chef in Saint Remy who's doing something rather unusual with olives and olive oil.

In central England, an RAF airbase with a Roman past, a forgotten medieval nunnery, a gold pendant from a 7th-century grave and a pub with a very long history of hospitality.

In Scotland, Monica Galetti and Rob Rinder discover Glenapp Castle, where guests are treated to a magical stay made possible by a dedicated team of local staff. Monica and Rob are put to work collecting home-grown veg for the kitchens.

A twisted serial killer is on the loose and only Terry and Gemma's coach tour knowledge can help police find the murderer.

Ardal O'Hanlon introduces the amazing Mawaan Rizwan and the hilarious Sara Barron.