She was a member of S Club from 1999 to 2003. She co-starred in the groups own TV series - Miami 7 (1999), L.A. 7 (2000), Hollywood 7 (2001) and Viva S Club (2002). She took part in three UK tours, won two prestigious BRIT Awards and numerous other awards. Along with Rachel Stevens, Spearritt was a regular pin-up in dozens of magazines and was a regular in the FHM Top 100 Sexiest Women polls between 2000 and 2004. Perhaps more importantly for her future career, she gained the chance to act in a movie, when S Club released their movie Seeing Double in early 2003.
Most famously, in October 2001, amid a blaze of publicity, Spearritt revealed that she had been in a secret relationship with fellow band member Paul Cattermole for the previous six months. In 2002, Cattermole was the first to quit the group and thereafter S Club 7 became simply S Club before ultimately splitting in May 2003. Spearritt and Cattermole’s relationship, however, would continue until early 2006.
In the last week of S Club’s existence, Spearritt’s management claimed she was at home in bed with the flu. She was actually in Los Angeles to audition for a role in the film Agent Cody Banks 2: Destination London, a fact that Hannah revealed at the UK premiere of the film on 2004-03-24 in London. She got the role and three days after leaving the band she began filming.
In March 2004, Spearitt successfully auditioned for a minor role in the horror Seed of Chucky, a movie which was seen by some as an attempt to distance herself from her squeaky clean S Club image. Shortly after completing filming, Spearitt decided to take a break from show-business to travel and spend time with her family.
In early November 2005, she made her acting comeback in the BBC’s Blessed, an eight part sitcom. In Blessed, she played a minor role, appearing as a member of a fake girl band, in two episodes. December 2005 saw Spearitt appearing in the unsuccessful West End musical, Snow! The Musical, at London’s Sound Theatre. The musical was cancelled just three weeks into its run because of poor ticket sales - one show managed to attract an audience of only two people.
In February 2006, it was revealed that Hannah had landed a lead role in a brand new ITV series called Primeval. Hannah plays the role of Abby Maitland, a reptile enthusiast who gets mixed up with time travelling Professor Nick Cutter (Douglas Henshall) when searching for a species of reptile she had never encountered. The series began on February 10, 2007.
In late 2006, Hannah began filming for ITV1, for a guest part in Agatha Christie’s Marple television mystery series. The episode, entitled At Bertram’s Hotel, was broadcast on September 23, 2007.