Today's TV: Join Shelia Hancock as she revisits some childhood haunts in Dorset

JULIE WALTERS narrates another episode of the series which celebrates the great outdoors, from iconic landscapes to hidden gems. The edition focuses on Dorset, as Sheila Hancock revisits some childhood memories at the Dancing Ledge rock pools, while Martin Kemp goes in the search of a special catch in the fishing village of Mudeford. Liz Bonnin witnesses the migrating birds of Portland Bill and Ben Fogle gets a sky-high view of the Jurassic coast.

David Harewood tries to find out why is Covid killing people of colour

Why Is Covid Killing People of Colour? (BBC1, 9pm)

Last year, it was reported that Black, Asian and minority ethnic patients were dying in disproportionate numbers from Covid-19. In this documentary, actor David Harewood tries to find out why. It’s a mission that begins in Brent, north-west London, which is one of the most diverse areas in the UK and, during the first wave of pandemic, had the highest Covid-19 mortality rate in the country. David explores whether this was mirrored in other parts of the country, and in the process, discovers that your job can be a huge risk factor when it comes to coronavirus. So why are so many people from minority communities working on the frontline? He also explores the statistics which suggest that it isn’t only Covid where your race can affect your health outcomes.

Stacey Dooley is inviting Britons to visit a one-stop-shop DNA testing clinic

DNA Family Secrets (BBC2, 9pm)

In the past decade, more than 26 million people have taken a DNA test and the growing popularity in over-the counter kits has created a network of databases that can tell people more than ever before about their families, ancestry and health. In this new series, Stacey Dooley is inviting Britons who want to find out more to visit a one-stop-shop DNA testing clinic. In the first episode, she meets up with 75-year-old Bill, who was born at the end of the Second World War. His father was an African-American GI who returned to the US at the end of the war – all his son really knows about him is his name. Now, Bill is hoping that his own DNA might be the key to finding out what happened to his father and if he has any living relatives in the US.

Banksy & the Rise Of Outlaw Art Sky Arts

Banksy & the Rise Of Outlaw Art (Sky Arts, 9pm)

A look at the mystery surrounding the anonymous street artist whose illegal stencils, pranks, invasions and interventions have outraged the establishment while captivating ordinary people for more than two decades. Despite being one of the most important cultural figures of our times, Banksy has remained an enigma. This documentary finally reveals his story, from his roots in a criminal subculture to his rise as the leader of an art revolution. Among the contributors are art promoter Steve Lazarides, Bristol graffiti pioneer John Nation, renowned street artists Ben Eine, Risk, Felix ‘Flx’ Braun and KET & Scape, and a host of cultural commentators.

Anna Friel as Marcella Backland

Marcella (ITV, 9pm)

The series comes to an end with a double bill – split by the news – as the undercover cop (played by Anna Friel) cuts ties with her old life and sets about becoming the centre of the Maguire family with Finn. Rav makes a last-ditch attempt to persuade her to return to her old life, but even mentioning her children can’t change her mind. However, will her conscience be so easy to ignore? Then in the second episode, the tensions Marcella has helped to create within the family look set to reach breaking point.

Everest: Conquering the Death Zone C5

Everest: Conquering the Death Zone (C5, 10pm)

Hundreds of people scale Mount Everest every year – there have even been concerns raised about the environmental impact of the amount of climbers who scale it – but a century ago, no one had reached the summit. This documentary looks at what it takes to conquer the mountain, from Howard Somervell who in 1924 got within 300m of the summit before being forced to turn back by illness, to the successful climb by Edmund Hillary and Tenzing Norgay in 1953. It also explores the dangers facing the Sherpas who act as porters and guides to 21st Century tourists.