Richardson was born on 27 September 1970 in Wellington, Shropshire, England.
Richardson sued Arnold Schwarzenegger and two of his aides, Sean Walsh and publicist Sheryl Main, over comments they made about her claims that he groped her. The case was settled in 2006.
Richardson fronted Channel 4's The Sex Education Show, broadcast from 9 September to 14 October 2008. The Sex Education Show returned in March 2009 as The Sex Education Show vs. Pornography. A third series The Sex Education Show: Am I Normal? was broadcast on July 2010. The fourth series, called The Sex Education Show: Stop Pimping Our Kids, aired from 19–21 April 2011. The fifth series began on 19 July 2011.
Richardson presents Channel 4's Secret Eaters, which began on 16 May 2012. She also presents How Not to Get Old alongside Louise Redknapp which began on 7 August 2013. Richardson and Andi Osho present Supershoppers, which began on Channel 4 on 1 February 2016, although Osho has now been replaced by Sabrina Grant.
She presents Channel 4's Naked Attraction, which began on 25 July 2016.
In 2017, Richardson co-presented How to Retire at 40 on Channel 4. In January, February and April of 2018, she was a guest panellist on four episodes of ITV's Loose Women. In February 2018, she co-presented How to Get Fit Fast with Amar Latif on Channel 4.
