Tonight's top watches include an Horizon Special about the race to create a Covid-19 vaccine, more Euro 2020 action, plus the final episodes of The Great British Sewing Bee and Rob Lowe comedy The Grinder . . .

Pick of the Day

Horizon Special: the Vaccine, 9.00pm, BBC Two

As news of the Covid-19 virus broke around the world, teams of scientists jumped into action to create a vaccine against a virus that no one had heard of before.

This Horizon special looks at the extraordinary inside story of the unprecedented quest to develop vaccines to fight Covid-19, with unique access to five teams of scientists around the globe.

This is narrated by the actress Lesley Sharp (below), who’s currently starring in - irony of ironies - Before We Die on Channel 4.

Don’t Miss

UEFA Euro 2020, 7.30pm, RTÉ2

Tonight it’s Italy v Switzerland (KO 8.00pm), where an Italian win will make them the first country to qualify for the last 16.

Jacqui Hurley is in studio to present coverage of the second Group A fixture, which takes place at Rome’s Stadio Olimpico.

Italy laid down a marker in the opening match of the tournament against Turkey, running out comfortable 3-0 winners, while Switzerland were held to a 1-1 draw by Wales.

Italy are coached by former Sampdoria and Lazio legend Roberto Mancini (above), who has impressed since he took over an ailing national side in 2018.

In the Footsteps of Killers, 10.00pm, Channel 4

This week, Emilia Fox and criminologist Professor David Wilson (below) investigate the disappearance of Suzy Lamplugh.

The estate agent vanished after making an appointment with a client in July 1986.

Despite the high profile of the case, nobody has ever been charged with Lamplugh's abduction and murder.

Following a series of clues, Emilia and David narrow the field of suspects down to just one man. Will he reveal the truth?

New or Returning Shows

Dispatches: Undercover in Africa’s Secret State, 11.05pm, Channel 4

Over the past two decades, more than half a million Eritreans have fled their home in eastern Africa, escaping one of the most repressive and secretive dictatorships in the world.

Reporting in Eritrea is almost impossible but for more than five years, Evan Williams has been gathering secretly shot footage from inside the country and interviewing some of those who have escaped.

Here he documents allegations of torture, arbitrary detention and indefinite forced conscription into military service.

Diana, Princess of Wales: in Her Own Words, 9.00pm, Virgin Media One

It just goes on and on . . .

Here, former Royal Butler Paul Burrell and some of Diana Spencer’s closest friends and confidantes lift the lid on the shocking/unprecedented events of her final months in this special.

It also features never-before-seen footage of Diana, recorded by her speech consultant between 1992 and 1993 as she sought to define her public persona and present her own version of events reported in the press, touching on her marriage and experience of public life.

Swamp People: Serpent Invasion, 9.00pm, Sky History

Streaming on NOW TV

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The second season of the nature/reality series opens with a grave threat on the loose in Florida’s Everglades as an invasion of Burmese pythons takes this natural wonder of the south under siege.

Entire species of animals are being wiped out as aggressive and ravenous pythons breed freely with no natural predator to stop them in their tracks.

Luckily, Troy 'King of the swamp' Landry, his sharpshooting son Chase, legendary gator-hunter Bruce Mitchell and big fish wrangler Zak Catchem are the men poised to combat these serpents.

New to Stream

Silver Skates, Netflix

On the frozen rivers and canals of the regal Russian city of St Petersburg, a petty thief on skates warms the heart of an aristocrat's daughter as forces try to keep them apart.

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Penguin Town, Netflix

In a picturesque South African town, an eclectic group of endangered penguins flock together to find mates, raise a family and mix with the locals.

Ending Tonight

The Great British Sewing Bee, 9.00pm, BBC One

Joe Lycett presents the final, in which judges Esme Young and Patrick Grant (above, with Joe) challenge the three remaining sewers' advanced skills.

First up they have to make a little girl's bridesmaid dress, complete with puff sleeves, lined bodice and big bows.

The transformation round sees them turn cushions, curtains and tablecloths into dramatic and fun summer festival outfits, before they construct an evening gown worthy of the red carpet in the most important made-to-measure of the competition.

The Grinder, 9.00pm, Fox

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The one-trick (but very enjoyable) Rob Lowe sitcom comes to an end with this double-episode.

After learning of Dean Sr's guilt, Stew suggests they settle the case. However, Dean believes they should try to win and wants to use one of his old `Grinder" tricks

In the final episode at 9.30pm, Dean Sr's malpractice comes to a surprising conclusion when Stewart gets sidelined, leaving it to the rest of the Sanderson & Yao team to save the firm and find out who has been the secret mastermind behind Cory Manler and Dean Sr's case.

Stewart is concerned that Dean's instincts and Grinder-isms won't be enough to win the day, and Dean is offended by his own brother's lack of faith.

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