The classical crossover act (plus pals) beat off competition from Rag 'n' Bone Man, Little Mix, and many charitable campaigns to score the top spot for the festive period.

"Rockabye" has now been at the summit of the UK charts for a mammoth seven weeks, accelerating towards almost 600,000 sales in the process.

"To have been Number 1 for seven weeks is something amazing in its own right that we are all incredibly proud of, but to now be Christmas Number 1 is mind-blowing," says Clean Bandit. "It’s something we never imagined would happen with Rockabye when we were writing and recording it. Thanks to everyone who has made this happen! We hope you all have a Merry Christmas and New Year!"

Buy the track now on iTunes, if you want.