Dev counts down to the UK's best-selling single of 2012.
BBC Radio 1, BBC Radio 1 N. Ireland, BBC Radio 1 Scotland, BBC Radio 1 Wales
Scott Mills gets closer to the big numbers in the Top 150.
Gemma continues the countdown of the UK's 150 top-selling singles of 2012.
Tom Deacon starts the countdown of the UK's 150 top-selling singles of 2012.
Scott Mills counts down the final Top 40 of 2012.
Reggie Yates counts down the Top 40 to reveal the UK's 2012 Christmas No 1!
Listen or watch as Reggie counts down the Top 10 with help from X Factor's James Arthur.
Gabrielle Aplin joins Reggie as he counts down the Top 40 singles in the UK.
Reggie has a video chat with Olly Murs, while he is backstage at The X Factor