The app did not pick up my ticket and a confirmation was never sent. I still had a reference number in My Booking but policy and system limitations to "re"issue a ticket that was NEVER issued is appalling. I talked to 7 GWR members of staff and spent 1.5 hours on the phone only to hear that I have to buy another ticket and claim a refund - this is valuable time that I don't have. Horrible resolution to a mistake made by a poor GWR system/app.
Train tickets, travel & times at Google Play market analyse