Back in the X Factor's glory days, there was no winner more glorious than 2006's Leona Lewis. The Hackney-born star was a favourite from the start and won the ITV show by a landslide and her cover of Kelly Clarkson's A Moment Like This made it to Christmas number one, selling more copies than the rest of that week's top 40 combined.
Massive hits including Bleeding Love - which stayed at number one for seven weeks in the UK - followed, but by 2014 relations between Leona and Simon Cowell's record label Syco had soured and she wanted out.
When she first joined, the company had been relatively small, but the likes of One Direction, Little Mix and a slew of other artists had seen it undergo a massive expansion.
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