D should not happen. There are no grounds for prosecution as no act of fraud has taken place. It would be easy to prove a pass has not been tampered with by looking at it under different lights and forensically testing for eraser markings. I am aware of another TOC who has used this method to prove in court a season ticket HAD been tampered with/fraudulenty produced. Remember it is up to East Midlands Trains to prove guilt, not the OP to prove innocence.
IF there is a written rule that markings have to be in pen, then I would put that down as a mistake filling the pass in and the day should have been voided and the next box filled in under the rules. If there is no written rule that the box must be filled in pen not pencil then the OP has met the criteria and if the RPI/guard wants to go over it in pen, fair enough but no rule has been broken so the pass should not be confiscated unless the RPI/guard has reason to believe the ticket HAS ALREADY been tampered with. Even if boxes are filled in pen, whats to stop a 6 being made an 8 or a 1 a 7? Will this RPI/guard confiscate any pass with a 6 on it just in case it gets tampered with.
I feel the OP should talk with their manager/own TOCs revenue department for advice. Revenue departments do talk so they may see the case quietly dropped.
we'll see what we can do about talking to her fathers manager, see if he can suggest anything. I really just hope it doesn't get taken too far, it seems like something that could get very messy if they don't accept her explanation.
The box she travelled with on that day was filled in with pen, so it's not like she could have gone back and used another box or anything. I guess we'll have to wait and see what their grievance with it is at the interview. We've already rung to confirm the appointment so hopefully they'll realise we're trying to be agreeable