There’s a moment midway through mgk’s two-hour spectacle at London’s O2 Arena where Colson Baker simply stops. “I know we have a strict 11pm curfew tonight but let me soak this in O2, let me soak this in,” he says, surveying the 17,000-strong crowd stretching from the floor to the nosebleeds. “If you’re in the building tonight this is very special, you only get to sell out The O2 for the first time one time and tonight is that night. This is ours, this one is for us.”