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

Rachel Riley is temporarily stepping down from Countdown while she focuses on another project, with newcomer Dr Crawford ...

Maths expert and TV presenter Rachel Riley is set to take a ‘short break’ from Countdown – with Dr. Tom Crawford stepping in ...

An Oxford and Cambridge university lecturer and YouTuber has made his debut on TV quiz Countdown. Dr Tom Crawford, who has ...

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

Rachel Riley is set to be replaced as co-host of Countdown. The 39-year-old has been hosting the game show since 2009 when ...

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

Oxford and Cambridge university mathematician Dr Tom Crawford will be stepping in as the game show's number expert.

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

A change from the usual glamorous number expert Rachel, Cambridge and Oxford university mathematics boffin, Dr Tom Crawford, ...

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, ...