Arts and Entertainment Countdown's Rachely Riley takes to the dance floor with partner Pasha Kovalev

The Countdown and Strictly star married her husband last August

The Week In Radio: Addison needs the genius of Armando

Just like the butterfly in chaos theory that flaps its wings and triggers an earthquake the other side of the world, so Terry Wogan's flit from Radio 2 caused seismic changes to shudder through the BBC schedule. Chris Evans has bounced into breakfast, noticeably improving as the week went on. He is accompanied by Moira Stuart, rehabilitated after she was shelved for being old, though why the sight of a 60-year-old woman was deemed unacceptable on television remains a mystery. I can think of plenty of male presenters who aren't exactly an oil painting – unless it's by Brueghel. Anyway, Chris Evans's move has the great advantage of bringing Simon Mayo into his old slot on Radio 2's Drivetime.

Carol Vorderman backs fights against power pylons

Television presenter Carol Vorderman has backed a campaign to stop a 400,000-volt overhead power line being put up near her countryside home.

Last Night's Television: The funny guys go red in the face

Comic Relief Does The Apprentice, BBC1<br/>Red Riding, Channel 4

A head 4 figures: How will Marcus du Sautoy make maths fun?

Marcus du Sautoy is Britain's most charismatic mathematician. He can make calculations in nine different dimensions. But that's the easy part.

Countdown, Channel 4<br>A History of Christianity, Channel 4<br>Could You Eat an Elephant? Channel 4

Jesus revisited by a 21st-century writer was a high point &ndash; unlike the return of a teatime institution

The broadcaster: Rachel Riley

Fresh out of Oriel College, Oxford, with a masters in mathematics, 22-year-old Rachel Riley is the new Carol Vorderman, taking on the role of human calculator in the revamped Channel 4 afternoon quiz Countdown. Riley was planning on a career in marketing but beat 1,000 rival applicants to the Countdown job where she will work alongside the dry-witted Sky Sports presenter Jeff Stelling.

2.1m watch Vorderman and O'Connor's final Countdown

More than two million viewers tuned in to see Carol Vorderman and Des O'Connor bow out of Countdown.

Two consonants and a vowel for Carol: Bye

'Countdown' co-host bows out with a few tears after a 26-year reign on Channel 4's puzzle programme

Vorderman's Countdown comes to an end

After 26 years, more than 4,500 shows and countless vowels and consonants, Carol Vorderman is finally hanging up her chunky black marker and leaving Countdown today.

Armstrong turns down 'Countdown' job

In a sudden change of heart after receiving his contract, Alexander Armstrong has told Channel 4 executives that he does not want to host the flagship conundrum show Countdown.

'Countdown' conundrum solved

The comedian Alexander Armstrong is set to give a 'leftfield' edge to the long-running Channel 4 quiz show

Maths wizard, 11, could be the next Vorderman

If countdown executives are struggling to find Carol Vorderman's replacement, they might want to consider their current contestant Kai Laddiman.

Countdown: The goodbye Carol Vorderman quiz

The presenter has resigned, and Channel 4 is looking for areplacement. Katy Guest puts prospective candidates to the test

Rebecca Tyrrell: 'It's a JFK/Diana moment in our home. Yes, Carol Vorderman has departed from Countdown'

I don't think I will ever forget Matthew's animal yelp of distress as he read a two-day old English newspaper in a Greek taverna on the tiny, peaceful island of Poros. "Sweet Lord Jesus, no," he wailed. "What have they done? God damn them all to hell, what have they done?"

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Syria crisis: Celebrities call on David Cameron to take more refugees as one young mother tells of torture by Assad regime

Celebrities call on David Cameron to take more Syrian refugees

One young mother tells of torture by Assad regime
The enemy within: People who hear voices in their heads are being encouraged to talk back – with promising results

The enemy within

People who hear voices in their heads are being encouraged to talk back
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Survivors of the Nazi concentration camp remember its horror, 70 years on
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Army general planning to come out
Iraq invasion 2003: The bloody warnings six wise men gave to Tony Blair as he prepared to launch poorly planned campaign

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Months before the invasion of Iraq in 2003, experts sought to warn the PM about his plans. Here, four of them recall that day
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The stories, the writers and the changes over the last quarter of a century
Homeless Veterans appeal: 'Really caring is a dangerous emotion in this kind of work'

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Wu-Tang Clan and The Sexual Objects offer fans a chance to own the only copies of their latest albums

Smash hit go under the hammer

It's nice to pick up a new record once in a while, but the purchasers of two latest releases can go a step further - by buying the only copy
Geeks who rocked the world: Documentary looks back at origins of the computer-games industry

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A new documentary looks back at origins of the computer-games industry
Belle & Sebastian interview: Stuart Murdoch reveals how the band is taking a new direction

Belle & Sebastian is taking a new direction

Twenty years ago, Belle & Sebastian was a fey indie band from Glasgow. It still is – except today, as prime mover Stuart Murdoch admits, it has a global cult following, from Hollywood to South Korea
America: Land of the free, home of the political dynasty

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These days in the US things are pretty much stuck where they are, both in politics and society at large, says Rupert Cornwell
A graphic history of US civil rights – in comic book form

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A veteran of the Fifties campaigns is inspiring a new generation of activists
Winston Churchill: the enigma of a British hero

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A C Benson called him 'a horrid little fellow', George Orwell would have shot him, but what a giant he seems now, says DJ Taylor
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Precious freshwater shellfish are thriving in a unique green project