Today I was stopped by what I believe to be a Revenue Protection Inspector and interviewed under caution. I was so frightened I can barely remember the conversation, but I had basically stupidly traveled on the wrong ticket - it allowed me through the barriers so I hadn't noticed that I bought on the app tickets to the wrong station, but he believed/had the theory that I was 'short changing' by purchasing a ticket for a shorter journey to get to where I really needed to be. This wasn't the case at all and I had genuinely made a mistake - how long until I receive a letter from their prosecutions department? I'm petrified. He had this conspiracy that I'd been doing it on multiple occasions that he verbalized and talking about checking security cameras etc., but only wrote about today (from what I remember). What am I in for? I'm so so scared.