Channel 4 confirm Rachel Riley’s Countdown replacement - Riley first joined Countdown in 2009 as a replacement for Carol ...

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

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

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 ...

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 fill in Rachel Riley's role on Countdown while she takes a break from the show.

A tattooed YouTuber is replacing Rachel Riley on Countdown in a shock shake-up and has announced the appointment to fans with photos from the Channel 4 set. A change from the usual glamorous ...

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

The Channel 4 maths whizz, 39, is taking a short break from the long-running show to work on another project. While she is ...

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