The X Factor isn't unanimously regarded as a fool-proof production line for long-term artists.
It’s been four years since One Direction emerged in third place on the programme, while the best part of a decade has flown by since Leona Lewis began her chart-topping career by being crowned queen of the ITV show.
Other notable names include JLS, who emerged in 2008 and went on to sell six million records, Olly Murs - now three albums into his career ...
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