A fan of singing and dancing as a child, he attended Bird College, a performing arts school in Sidcup, South East London.

[4] Collier first worked as a backup dancer for Olly Murs and Eoghan Quigg on The X Factor.

Theatre credits include Book of Mormon, Cats, Fame, Joseph and the Amazing Technicolour Dreamcoat, Peter Pan, and Wicked.

[5][6] Conor Clark of Gay Times called the impersonation "iconic".

[7] Collier was one of the three finalists, competing against Krystal Versace and Kitty Scott-Claus in the final lip-sync to "You Don’t Own Me" by Dusty Springfield.