The group has released sixteen singles so far, of which thirteen have reached the Top 10 on the UK Singles Chart. There was one UK number-one single, "What About Us". In addition, the group has had five Top 10 albums on the UK Albums Chart, which were all certified by the British Phonographic Industry.
Sandford had a relationship with Dougie Poynter from 2008-2010. She began a relationship with Wayne Bridge in 2010. The couple's son was born in 2013. The couple married in 2014.