You are not suggesting that they (FCC) lie, are you?
No I am not suggesting that a company of integrity such as FCC would lie - this is a serious allegation, and I do hope you didn't read that.
I was simply suggesting that "summoned to answer the charge of being caught by inspector without a valid ticket at Grange Park" would be changed to to"summoned to answer the charge of being caught by inspector without a valid ticket between Grange Park and Alexandra Palace".
Doing the above would be lawful and above board. Asking the RPI to lie under oath. Is not lawful.
Note there is the legal concept of 'the slip rule' which would allow a prosecutor to correct a minor and trivial error (in my view, this is not).
If I may sum up the OPs options:
We have option A - the safe option
He could do the usual grovelling letter offering to pay £x (3 or 4 figures) to cover FCC's costs and the journeys made. NOTE THAT IF THIS IS BEING CONTEMPLATED advice is needed, to ensure that one doesn't self-incriminate and cause a bigger problem.
Option B would be to stand up and be counted, and potentially attend court
In my opinion (based on the information given here, and assuming you haven't said anything silly in your letters) there are three prongs to your defence:
-location of the ticket check (remember you have a right to not self-incriminate).
-the advice of the ticket office 6 years ago to split your tickets, the continuing tendancy of FCC to sell you both tickets, and their failure to inform you of a change to their policy.
-NRCOC with clause 19c, with a 'different' reading of season ticket issued by a PTE/local authority
What do you think?