Rachel Riley has been temporarily replaced on Countdown by a tattooed YouTube mathematician who teaches equations in his underwear. Dr Tom Crawford, known for his Tom Rocks Maths channel on the ...

Countdown's Rachel Riley will be temporarily replaced by YouTube math star, Dr Tom Crawford. It was announced that Riley, Countdown's very own mathematician, will have to step down from her hosting ...

Mathematician Dr Tom Crawford will stand in for Rachel Riley on Channel 4’s Countdown while she takes a short break to work on another project, it has been announced. Dr Crawford is well-known for his ...

TV star Rachel Riley has lifted the lid on what one of her famous co-star's is like behind the camera. The maths whizz has made a name for herself on Countdown and its comedy spin-off 8 Out of 10 Cats ...