1. “I thought it was declassified” is not a defence.
2. You cannot be issued a fine on the spot, as only a court can issue a fine. Some staff may choose to deal with passengers whom they suspect of mistakenly committing a ticket violation by issuing a penalty fare, but doing this rather than reporting for prosecution is at the discretion of the staff member, and it appears the staff member whom you spoke with has chosen not to do so.
3. There is no requirement for any “amounts” to have been “explained to you”.
4. Complaints about the conduct of the staff member in an attempt to “muddy the waters” will be ineffective and will be more likely to harm your case by making you appear uncooperative and argumentative than help it. If you wish to pursue a complaint about the staff member you can do so independently of dealing with the ticket violation. Before you do, however, I would suggest you reflect on whether the staff member was genuinely acting inappropriately or was just telling you things you did not want to hear.
5. He was not entitled to hand you a fine and did not do so (see 2). Staff members acting in this context are required to produce ID to you if you ask for it, but you do not say you asked.
6. A report for prosecution does not require that paperwork be issued to the passenger.
Other notes
7. there are no “Miranda rights” in the UK, that is entirely an American concept.
8. Can you share what train you travelled on so we can check if it may have been declassified?
Thanks for the response.
Re: 1, I figured as much - thanks for clarifying.
Re: 2, 3 and 5, fair enough.
Re: 4, I do feel he was acting in an inappropriate manner. For example, when he asked where I was born, I assumed he meant country so said England, and he angrily responded "Obviously you were born in England - where in England".
Re: 6, so do I now just wait for the letter to arrive? I hadn't noted the distinction between a penalty fare and a report for prosecution - what consequences can I expect from this?
Re: 7, apologies! Whatever it's called, he told me I had the right to remain silent and anything I did say might affect me etc. etc.
Re: 8, it was the 07:57 from Surbiton to Waterloo. I had my headphones in so wouldn't have heard if they had declassified it unfortunately.