RACHEL Riley has been temporarily replaced on Countdown – by a YouTube star. The Channel 4 words and numbers show will ...

Rachel Riley is set to be temporarily replaced on Countdown by mathematician Dr Tom Crawford, as she takes a brief hiatus ...

EXCLUSIVE: Countdown star Rachel Riley shared her thoughts on leaving the Channel 4 show just days before it was announced ...

Countdown 's Rachel Riley will be temporarily replaced by YouTube math star, Dr Tom Crawford. It was announced that Riley, ...

Rachel Riley replaced by 'brilliant mathematician' on Countdown - Riley is taking a short break from the Channel 4 show ...

Rachel Riley, 39, is urging people to be clued up on their bodies, after losing a friend who showed no obvious signs of ill ...

Rachel Riley will be replaced as the show's co-host by a mathematician and YouTuber while filming a new project .

Dr Tom Crawford’s videos of teaching equations in his underwear have helped him attract more than 200,000 subscribers ...

Mathematician Dr Tom Crawford will stand in for Rachel Riley on Channel 4's Countdown while she takes a short break to work ...

Mathematician Dr. Tom Crawford will fill in Rachel Riley's role on Countdown while she takes a break from the show.

COUNTDOWN has had a classic moment where a rude word was spelled out – leaving Rachel Riley blushing. The Channel 4 show has been prone to a racy word or two over the years. And during ...

EXCLUSIVE: Rachel Riley shared her thoughts on leaving Channel 4 show Countdown, days before it was announced she will be ...