"They had to audition singers from a children's choir (assembled by Damian 'Midfield General' Harris) and admitted they opted for an eight year old who was less slick than the rest (otherwise they were worried they may have a Moby record on their hands)." (Single: Justice D.A.N.C.E. Again)
I haven't been able to figure out which one is the eight-year-old lead singer -- but anyway, here's the full list: Aubrey Allegretti, David Christopher Ragusa, Demitri Mitchell-Palmer, Felix Zadek-Ewing, Francesca Levin, Harriet Syndercombe-Court, and Matthiew Cullen O'Keefe. (Discogs)