Unfortunately, it’s always the things you don’t think of that get you. In this case, they hadn’t thought of the little blue booklet on their counter, the one that said "British Rail Passenger Timetable, Christmas & New Year Supplement". January 5th was the last day of the schedule, and one of the trains they’d planned to use wasn’t running. They’d had to wait for a later one—one that would reach Kings Cross only six minutes before the Hogwarts Express left.