The fourth series was won by gymnastic troupe Spelbound, with dance duo Twist and Pulse finishing in second place and drummer Kieran Gaffney in third place. During its broadcast, the series averaged around 11 million viewers, while the live episodes of this series were the first to be broadcast in high definition; both the audition episodes and its sister show, Britain's Got More Talent, remained in standard definition until the following year.
Following open auditions held the previous year, the Judges' auditions took place across January and February 2010, within Manchester, Glasgow, Birmingham, London and Cardiff. They also took place within Newcastle upon Tyne, after they were cancelled at the last minute during production of the previous series. The Birmingham auditions were most notable in this series, due to the fact that because Cowell fell ill before he could attend them, marking the first time in the show's history he was unable to attend auditions, Louis Walsh replaced him as a guest judge for these until he had recovered.
Of the participants that took part, only forty made it past this stage and into the five live semi-finals, with eight appearing in each one, and ten of these acts making it into the live final. The following below lists the results of each participant's overall performance in this series: