While we’re all looking forward to Christmas time, it goes without saying that the few days before the big day can be stressful, particularly when it comes to getting home to wherever you need to be. Huge crowds and packed-to-the-brim trains can cause travel chaos in the lead up to Christmas, so it’s usually advisable to book a ticket beforehand to ensure you have a seat and won’t have to queue up for hours on Christmas eve. But when exactly should you book that ticket?