My train was late last night. Here in the UK you can apply for a partial/full refund for your ticket, so I went and found the claim form PDF.
You of course need to attach your ticket to the form as proof of purchase.
Normal people would think that a paperclip or staple would be the preferred method of doing this (or perhaps since it's 2012, not having to snail-mail a form in at all), but Cross Country trains have a different idea:
Licking my printout didn't help stick the ticket to it at all. Maybe my printer is out of glue?