Hello, I have read with interest postings re: Transport Investigations Limited. I unfortunately am having to deal with them currently and am after any advice fellow consumer action group members may be able to offer. In summary, I use a mobile train ticket app which entails purchasing upfront a bundle of 12 journeys in a package. So they are pre-paid tickets which require individual ticket activation before use. On the particular day in question I genuinely forgot to activate a ticket until arriving at my destination. This may also have been down to the app being very tempremental and frequently crashing before I can perform the activation (a problem I have reported to the TOC). So this is a case of late activation of a pre-paid ticket. Once I had activated my ticket upon arrival at my destination I used the app which generates a bar code and I showed this bar code to the automated barrier scanner which alllowed me to exit the station at my destination proving my ticket valid. This was in full view of TOC staff. I was stopped by a RPO working for Transport Investigations Limited once I had passed through the barrier and had the activation time of my ticket checked which showed it had been activated after the train I was travelling on had arrived at my destination. I was questioned about this and allegedy accused of having travelled without a valid ticket, despite other passengers queuing up to buy tickets at their destination (ie paying at the end of their journey, thereby geuinely travelling without a valid ticket,which seems to be tolerated, surely you can only have one rule either you must have a ticket before boarding a train or not (pay on the train is allowed or pay at the other end)) I am being pursued by Transport Investigations Limited now alleging I travelled with intent to avoid paying a fare. I dont know if anyone else has had experience using these mobile app based tickets. I have used the app since March 2014 without incident and prior to that purchased paper weekly tickets and have done so since early 2008. They have sent a letter now saying an application may now be made to issue a court summons. I have replied in full with my version of events in writing, but the letter I have had back, in common with experiences of eveyone else on here, has none of my points/questions addressed. I now have a week to reply before they take it further, I obviously wish to avoid court and would rather accept an administrative settlement. Indeed the TOC policy I have checked says that court is only used as a very last resort the offer of paying the fare (which I of course paid upfront weeks before so they have my money) plus an admin fee is the first option. I would welcome any advice fellow commuters could offer, this has been causing me some stress as I attempt to recover from a recent hospitialisation for surgery.