Yet the PA blaring out What Makes You Beautiful sparked an unlikely audience sing-a-long, although even Harry Styles's lot couldn't have matched the reception Sam McTrusty and company received when they arrived onstage.

They truly were conquering heroes, and could have recited the phone book to massed cheers. While it's understandable the odd fan of the group's earlier, more complex work might be less than impressed at the route to mainstream fame the foursome have followed, it was hard not to be swept along by the sheer force and energy of their songs.