Yesterday I boarded a GA train from Wymondham to Norwich using the return portion of a Wymondham to London Terminals (via Cambridge) ticket. I asked the guard for the change of route excess for only that leg but he said that he could only sell me the excess for both legs. I asked for a single to Norwich which he sold me and I tried to sort out the problem there. However the ticket office said the same thing and I bought myself an excess to Diss (as I was worried that I would get hassle from the staff on the barriers otherwise). I subsequently boarded a train to London Liverpool St and the conductor inspected my ticket. I asked her for the excess to which he asked where I was going, I explained that I was going to London Liverpool St. She noticed the route restriction but simply marked the ticket, said not to worry about it and gave it back to me. Given that I had to buy a new ticket which was effectively unused do I have the right to a refund of that new ticket (and excess)? I have asked GA for a refund on the basis that the ticket office at Norwich should have sold me the correct excess or failing that just endorsed my ticket and let me travel at no extra cost. What should I do in future situations, I presume the best option is to buy the excess from the guard and ask for a refund later (as the other half was not used)?