and his songwriting and production team Xenomania earned the group critical acclaim, due to an innovative approach to mainstream pop music. The group became one of the few UK reality television acts to achieve continued success, amassing a fortune of £30 million by May 2010. Guinness World Records lists them as "Most Successful Reality TV Group" in the 2007 edition. They also hold the record for "Most Consecutive Top Ten Entries in the UK by a Female Group" in the 2008 edition and are credited again for "Most Successful Reality TV Group" in the 2011 edition. The group was also named the United Kingdom's biggest-selling girl group of the 21st century, with over 4.3 million singles sales and 4 million albums sold in the UK alone. In 2006, Harding signed a £100,000 deal to model Ultimo lingerie, following the likes of Penny Lancaster, Rachel Hunter and Helena Christensen. Alongside her Girls Aloud bandmates, Harding made a cameo appearance in St. Trinian's in 2007. She took on her first major acting role in 2008, appearing in the low-budget thriller Bad Day. Harding wore a brunette wig for the role of Jade Jennings. The film also stars Donna Air and Claire Goose. She also collaborated with London synthpop band Filthy Dukes on a cover of "Real Wild Child", recorded for the film Wild Child. In July 2009, Girls Aloud announced they would take a year-long hiatus to pursue solo projects, but would reunite for a new studio album in 2010. During Girls Aloud's hiatus, Harding decided to focus on her acting career. "Singing was always my main ambition, but acting was something else I wanted to achieve", Harding said. Harding appeared in the BBC television film Freefall, written and directed by Dominic Savage. The film aired on BBC Two on 14 July 2009. Harding portrayed Sam, the beautician girlfriend of Dominic Cooper's character. The drama is a satirical take on the financial crisis of 2007–2008. Company magazine said that "Sarah Harding showed she's got real acting potential in her convincing, but fleeting performance." Later that year, Harding returned to the St. Trinian's franchise with a starring role in St. Trinian's 2: The Legend of Fritton's Gold. Despite her age, Harding portrayed teenage rebel Roxy, a new student at St. Trinian's School. The film received overwhelmingly negative reviews, holding a 10% 'rotten' rating on Rotten Tomatoes. Harding worked with Girls Aloud producers Xenomania