Una's diction was really weird when she sang it. For some reason she slowed down her words and went 'we're all AH-NAH-MUL' which sounded awful, and Mollie was dreadful, too.
Rochelle and Frankie were fine, and Vanessa was a bit off. It's quite a hard song to sing and it's more of a club anthem than an actual "song" so i'm not that worried. This (and Forever Is Over) will probably be one of the only singles they struggle with singing live.