TV Guide UK Tonight: Tue 21 Jul 2026 – The Undeclared War, Sewing Bee & EastEnders

Published: 15 July 2026

Tuesday 21 July 2026. Channel 4 brings back its biggest returning drama of the summer tonight, with The Undeclared War landing at 9pm four years after its first run. BBC One keeps the evening busy too, running Our Lives: Principal Ballerina at 7pm, EastEnders at 7:30pm and The Great British Sewing Bee at 8pm back to back. Over on ITV1, new documentary series Inside The Langham opens the night at 7:30pm before crime drama The Dark returns at 9pm. There’s live cricket on Freeview too, with The Hundred giving BBC Two an afternoon of action.

Quick Picks: Tonight’s Best

• The Undeclared War ⭐ Channel 4, 9pm. Peter Kosminsky’s cyber thriller returns with Simon Pegg and Siân Brooke.
• The Great British Sewing Bee BBC One, 8pm. An adaptive top and a single-colour outfit test the sewers.
• Inside The Langham ITV1, 7:30pm. New series goes behind the scenes at the London hotel.
• The Dark ITV1, 9pm. Laura Donnelly’s detective closes in on a masked killer.
• EastEnders BBC One, 7:30pm. Jack, Lauren and Joel all have their own crisis to face on the Square.
• The Hundred: MI London v SunRisers Leeds BBC Two, 2:15pm. Live cricket on terrestrial TV this afternoon.

Early Evening

Our Lives: Principal Ballerina – BBC One, 7pm

This half-hour strand turns its attention to Melissa Hamilton, the Northern Irish dancer who took an unusually late and roundabout route into ballet before working her way up to Principal at the Royal Ballet. It’s a study in stubbornness paying off rather than a straightforward talent story, tracking how far outside the traditional pipeline she started. BBC iPlayer.

EastEnders – BBC One, 7:30pm

Albert Square has no shortage of tension tonight. Jack finds his emotions harder to keep in check than usual, Lauren is pushed towards a decision she’s been avoiding, and Joel discovers that coming back to Walford isn’t the fresh start he might have hoped for. BBC iPlayer.

Inside The Langham – ITV1, 7:30pm

A new documentary series opens tonight with a look behind the scenes at one of London’s oldest grand hotels. Culinary director Michel Roux is at the centre of the first episode, steering preparations for a charity dinner catering to around 200 guests while the rest of the hotel carries on around him. It’s the kind of access-all-areas format that lives or dies on its characters, and the staff here look promising. ITVX.

The Great British Sewing Bee – BBC One, 8pm

Judges Esme Young and Patrick Grant hand out two testing briefs this week: an adaptive top that has to line up its pattern perfectly, and a made-to-measure outfit built in a single colour with nowhere to hide any mistakes. It’s the kind of episode that separates the sewers with genuine technique from those coasting on confidence. BBC iPlayer.

Bake Off: The Professionals – Channel 4, 8pm

The semi-final arrives, and it’s a demanding one. Four remaining teams have to produce delicate îles flottantes before building an ambitious showpiece around a floating theme, with a place in next week’s final resting on how well the structures hold up under their own weight. Channel 4 streaming.

Inside Longleat – Channel 5, 8pm

The second series of this fly-on-the-wall documentary settles back in with the Thynn family and the staff who actually keep the estate ticking over day to day. Tonight’s focus falls on water bailiff Nick, who spends his time keeping Shearwater lake in order, alongside a visiting pantsula dance troupe adding some unexpected colour to the grounds. Channel 5 streaming.

Prime Time

The Undeclared War – Channel 4, 9pm ⭐

Peter Kosminsky and Colin Teevan’s cyber thriller comes back four years after its first outing, and it’s picked a smart moment to return given how much the subject matter has aged into relevance rather than out of it. Simon Pegg reprises his role as Head of Operations Danny, now under fresh pressure as the fallout from a previous Russian cyber-attack collides with a new and more dangerous threat. The focus this time shifts towards Saara Parvin, a GCHQ newcomer played by Hannah Khalique-Brown, thrown into frontline decisions she isn’t fully prepared for. Siân Brooke returns as Barbara, adding weight to a returning cast that never feels like it’s just going through the motions. This is the one to clear space for tonight, and the whole series drops on Channel 4 streaming straight after broadcast.

The Dark – ITV1, 9pm

This crime drama’s second outing keeps its focus tight on DI Monica Kennedy, played by Laura Donnelly, and her colleague Connor, played by Mark Rowley, as they close in on a masked killer who doesn’t always stick to the plan. That fallibility is what keeps it interesting: this isn’t a flawless mastermind, and the cracks in the plan are where the drama lives. ITVX.

Murder 24/7 – BBC One, 9pm

This West Mercia Police documentary strand follows a case that begins with a 4am emergency call from Droitwich. Officers arrive to find Joanne dead at the scene, and the episode traces the early hours of an investigation that carries over into tomorrow’s conclusion. BBC iPlayer.

Oti and Richard’s South African Odyssey – More4, 9pm

A new travel series pairs former Strictly champion Oti Mabuse with her friend, the Reverend Richard Coles, for a tour of the country she grew up in. The opener takes in a fabric market in Johannesburg and a lively pantsula dance troupe, setting a tone that’s as much about her personal connection to the places as the sights themselves. More4 streaming.

Johnny Vegas’s Little Shop of Antiques – Quest, 9pm

Johnny Vegas and Bev Dixon keep the antiques pop-up running at Dagfields in Cheshire, while colleague Vikki works on getting Vintage Vegas trading online alongside the physical shop. A trip out to Anglesey in search of fresh stock rounds out an episode that’s as much about the people bickering over prices as the objects themselves. Quest has this streaming on Disney+.

Faithless – Sky Atlantic, 9pm

This Swedish drama reaches its conclusion tonight across a two-hour run, with David and Marianne’s entanglement finally pushed past the point of no return. Plain-spoken and unhurried in the way a lot of the best Scandinavian imports tend to be. Now.

Best Medicine – Sky One, 9:30pm

This comedy-drama, set in the kind of close-knit Cornish community that will feel familiar to fans of the genre, leans on Josh Charles as the prickly doctor whose bedside manner needs work but whose instincts rarely let him down. Now.

Late Night

Gogglebox – Channel 4, 10pm

The sofa critics work their way through the week’s biggest television, taking in everything from The Celebrity Traitors to Strictly Come Dancing and Hollyoaks. Reliable comfort viewing to close out a heavy night of drama. Channel 4 streaming.

The Chase Around the World – ITV1, 10:45pm

Bradley Walsh and the Chasers take the format on the road for a new series, kicking off in Rome as a fresh set of contestants try to build a pot big enough to survive a Chaser’s final push. A change of scenery gives a familiar format some welcome novelty. ITVX.

Sport

BBC Two is the pick for Freeview sport fans this afternoon, with live coverage of The Hundred as MI London take on SunRisers Leeds from 2:15pm; the same match also runs on Sky Sports from 2:30pm for anyone with a subscription. Cycling fans get an individual time trial on the Tour de France’s Stage 16, from Évian-les-Bains to Thonon-les-Bains, live on TNT Sports 1 from 11:30am. Darts’ World Matchplay continues into day four from Blackpool, with coverage on Sky Sports Main Event from 9:30pm.

The Viewing Schedule

What’s On Streaming

• BBC iPlayer: Our Lives: Principal Ballerina, EastEnders, The Great British Sewing Bee, Murder 24/7
• ITVX: Inside The Langham, The Dark, The Chase Around the World
• Channel 4 streaming: Bake Off: The Professionals, The Undeclared War, Oti and Richard’s South African Odyssey, Gogglebox
• My5: Inside Longleat
• Disney+: Johnny Vegas’s Little Shop of Antiques
• Now: Faithless, Best Medicine

Frequently Asked Questions

Is EastEnders on tonight (Tuesday 21 July 2026)?

Yes. EastEnders airs on BBC One at 7:30pm tonight, with Jack, Lauren and Joel all under pressure on the Square. It’s also available afterwards on BBC iPlayer.

What time does The Undeclared War start on Channel 4?

The Undeclared War returns to Channel 4 at 9pm tonight. Simon Pegg and Siân Brooke are both back, and the full series is available to stream on Channel 4 straight after broadcast.

Is Inside The Langham on ITV1 tonight?

Yes. This new fly-on-the-wall series about London’s Langham hotel launches on ITV1 at 7:30pm, with culinary director Michel Roux overseeing a large charity dinner. It also streams on ITVX.

What sport is on Freeview TV tonight?

BBC Two carries live coverage of The Hundred as MI London face SunRisers Leeds from 2:15pm, with the same match also on Sky Sports from 2:30pm. The Tour de France’s Stage 16 time trial runs on TNT Sports 1 from 11:30am, and World Matchplay darts continues on Sky Sports from 9:30pm.

What’s the best thing to watch on TV tonight (Tuesday 21 July 2026)?

The Undeclared War on Channel 4 at 9pm is the night’s standout, a returning cyber thriller with a strong cast and real tension. The Great British Sewing Bee on BBC One at 8pm and Inside The Langham on ITV1 at 7:30pm are both worth setting aside time for too.

Final Verdict

Tuesday 21 July has one clear priority: The Undeclared War on Channel 4 at 9pm, a returning cyber thriller that’s lost none of its edge and gains a strong new lead in Hannah Khalique-Brown alongside Simon Pegg. The Great British Sewing Bee on BBC One at 8pm and Inside The Langham on ITV1 at 7:30pm both make good company either side of it, and The Dark on ITV1 at 9pm is worth staying with if crime drama is more your speed. Cricket fans have The Hundred live on BBC Two from mid-afternoon, and EastEnders keeps its regular 7:30pm slot on BBC One if you just want to catch up on the Square.

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