The fourth UK series of The X Factor was broadcast on ITV between 18 August and 15 December 2007. The final 12 were declared on 7 October 2007.
Each of the four judges – Dannii Minogue, Sharon Osbourne, Louis Walsh and Simon Cowell – were allocated to one of four categories who they would mentor. The six contestants in each category performed at the judges house before the final three in each section were chosen to proceed to the live finals. The live shows began on 20 October 2007, with each of the contestants performing in front of a studio audience. Viewers voted for the act that they wanted to keep in the competition and, for the first six weeks, the two acts with the fewest votes were declared the bottom two. The judges had to decide which act they wanted to eliminate. In weeks 7 and 8, the act with lowest number of votes automatically left the competition. In the final, Same Difference left the competition after performing three songs, before Rhydian Roberts and Leon Jackson (both mentored by Minogue) performed the winners' single, "When You Believe". Jackson won the competition and earnt a £1 million recording contract.
The Boys category was mentored by Dannii Minogue. Contestants in this category are males aged 14 to 25. The six candidates were Luke Bayer, Charlie Finn, Dominic Harris, Leon Jackson, Rhydian Roberts and Andy Williams. Minogue chose:
Leondre Leon Jackson (born 30 December 1988, aged 18 at the time of the show) is from Whitburn, West Lothian, Scotland and was a retail sales assistant at the time of his appearance on the show. He auditioned in Glasgow having only started singing properly in August 2007. Jackson says that singing is the only thing that makes him happy. Before he made it through to the finals, Jackson had been planning to start an Architectural Technology course at Napier University.