Rachel Riley is known to millions as the co-host and resident mathematician of the cult TV show 'Countdown', and its off-shoot '8 out of 10 cats does Countdown'. In 2013 she appeared on the hit BBC show 'Strictly Come Dancing'. Now she's taking on the online trolls with the Centre for Countering Digital Hate. In the first episode of Women Tech Charge series 2, Rachel Riley talks to Anne Marie Imafidon about being Britain's favourite TV mathematician, and why we should do maths, not war.

Rachel Riley is on Twitter and Instagram at @RachelRileyRR.

Anne Marie Imafidon is on Twitter @aimafidon and Instagram @notyouraverageAMI

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