Autumn 2012. It’s the middle of the night and Mark Meharry is working late. More specifically, he’s camping out in his company’s freezing cold north London office, safeguarding a large cardboard box.

Music Glue is handling ticketing for Mumford & Sons’ Tour Of Two Halves (the company’s first arena tour), and the value of the cargo inside the box is huge.

“We’d never done a tour like it before, so we didn’t think how many tickets that would be until ...