The 'Chapman Square' singers performed hits from their debut album at London's O2. See their Jingle Bell Ball journey here.
Lawson's Andy Brown Says The Justice Collective "Deserve" Christmas Number One – Audio
The 'When She Was Mine' singer tells Capital it's been a "dream come true" working on the track with some of his idols.
Lawson lead singer Andy Brown has confessed that it was an "absolute honour" to work with the likes of Robbie Williams and Paul McCartney on The Justice Collective's charity song 'He Ain't Heavy, He's My Brother', and thinks the track deserves to be Christmas number one.
The 'Taking Over Me' star told Capital FM that the song, a cover of The Hollies' track of the same name, is "incredible" and was thrilled to be singing with some if his idols.
"I'm just delighted to be involved. I mean I'm singing alongside some of my idols like Paul McCartney and Robbie Williams," he said. "The song's incredible itself, 'He Ain't Heavy, He's My Brother', it's got a great meaning behind the song and I really think it deserves to be Christmas number one this year."
The star also opens the entire track, singing the first line and called it a "dream come true" to receive such an honour considering his background.
He added: "I mean the fact that I'm opening it is just an absolute honour and a dream come true for me being a Liverpool fan and also born and raised in Liverpool."
The song will raise money for the families of the victims of the 96 Liverpool fans who lost their lives at an FA Cup semi-final at Hillsborough back in 1989.
The song will be hoping to take over from last week's number one and X Factor winner James Arthur.
Listen to Andy Brown speaking to Capital FM about working on the song and his hopes for a number one below:
Don't forget to tune in to the Vodafone Big Top 40 this Sunday (23rd December) with Rich and Kat to find out who is the Christmas number one for 2012.