Dickson has been the distinctive voice of the show since it first started in 2004.
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"After the best 11 years with the X Factor, it's time for me to check out and cut loose," Dickson confirmed on Twitter.
Dickson began his career at the BBC and was the corporation's youngest ever TV news presenter at the age of 17.
He had stints on BBC Radio 2 as an announcer and worked on The Steve Wright Show on Radio 1. His own Peter Dickson's Nightcap ran for four years on Radio 2.
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