Trainline lies. They sell flexible tickets that are not flexible. I purchased flexible tickets a few hours before my planned trip. I attempted to change the time of departure as is permitted by the tickets but they have no available phone number to call. The service allows you to book flexible tickets but only has email as an option for contact. I emailed and they did not respond for a day. After this they refused to accommodate any refund or change of tickets. They simply said it's my fault that I wanted to change and shouldn't emailed sooner. There was no option to email sooner since I just purchased the tickets.