Track is out on September 16
Singer insists the track is "not a single or anything official"
Singer apologises to fans for any offence caused by 'Do They Know It's Christmas?'
Releases by Jake Bugg, Rod Stewart and Daft Punk also feature in 2013's biggest selling albums of 2013
'Wild' singer confirmed her departure from the show last week
'Our Version Of Events' has spent 63 weeks in the Top 10
'Next To Me' singer tweets picture of old granny sticking her middle finger up
'Our Version Of Events' returns to the top of the Official UK Album Chart
Singer will perform last at awards ceremony this evening (February 20)
Mumford & Sons and The Black Keys are also tipped to win on Wednesday (February 20)