Bletchleyite
Veteran Member
It depends on which retailer you book your tickets with.
I did exactly the same thing with TPE not so long ago- bought the ticket for the day before the one I meant to. I could amend the ticket for free. The day after was cheaper and sadly there was no refund, but at least I wasn't charged a tenner for nothing.
There are such apps, though they don't usually offer splits or a seat selector, both of which I consider important features when using Advances.
