Yet another faux-pas by
Network Fail. (and yes, I've kept that polite at the employers incompetence). Then again the same resources office has a knack of sending out wrong tickets/incorrect tickets or ticket collection information that bears no relevance to the journey being undertaken. Actually providing some form of ticket is a minor miracle in itself for them.
In fairness to the OP, it also depends on what actual route plan was shown for the tickets. I know Bingham - Grantham - York is the most obvious way, but perhaps NR haven't booked it that way. A couple of years ago I had to accompany a trainee signaller for a disciplinary, whilst in the school at York. Management provided a travel ticket for me; however it gave me two Anytime singles (there and back), instead of a return. In the end it cost NR £112 plus my wages for about two hours travel and an hour or so meeting.