Rachel Riley

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Rachel Annabelle Riley (born 11 January 1986) is an English television presenter. She co-presents the Channel 4 daytime puzzle show Countdown and its comedy spin-off 8 Out of 10 Cats Does Countdown. She is a mathematics graduate. Riley's television debut came when she joined Countdown aged 22. With an interest in popularising mathematics and the sciences, she has since co-presented The Gadget Show on Channel 5 (2013–14) and It's Not Rocket Science on ITV (2016). She was also a contestant on the BBC celebrity dance show Strictly Come Dancing in 2013. As an anti-racism campaigner, Riley was appointed a Member of the Most Excellent Order of the British Empire (MBE) in the 2023 New Year Honours for services to Holocaust education and antisemitism awareness. In October 2025, she received the Freedom of the City of London in recognition of her outstanding contributions to Holocaust education and antisemitism campaigning.