That officially work?
Hoping they'll start cancelling services soon so there's a lottery chance of getting my money back for a return to Norwich next month.
Yes. I did it on Trainline for some advance I had.
For the Burnley game I had 3 sets of advance for £90 ish.
I did change ticket and selected a random date in the future. I chose any trains going up and back. Its hard to see which ones are apen or advance on this view, but it doesn't matter yet.
Now when they are in your basket, before you pay there's a small link that says "other types of tickets are available" or similar. Click that and it has open off peak returns.
Mine came to £210 for 3 people. So it refunded the £90, which you need to wait for, and I had to pay the full £210. I had not yet collected my tickets, so it was easier. But if you have collected then you need to post them back
I then went back into bookings and did a full refund on the new off peak journey