Rachel Riley’s Countdown replacement has been confirmed as the ... It has now been confirmed that Dr Tom Crawford will be stepping into Riley’s shoes while she is away. Crawford runs a YouTube channel ...

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

Math whiz Rachel Riley is temporarily leaving Countdown to pursue another project, with a new host stepping in to handle her number-crunching duties.