As NONE of the TVMs (ticket machines) at Hatfield can sell advance tickets (besides from late afternoon the day before), I really have a problem believing you, or someone else, got a ticket the night before and you could forget exactly when you, or someone else, got that ticket.
It had to be the night before! How could you forget that? By being unsure, or saying you were unsure, it's no wonder the RPI thought you were lying. It doesn't sound believable at all!
And if you knew nothing about ticket prices, how could you have asked for that specific ticket? Did your friend not ask if you were coming back? Surely if they used the TVM then they would have seen the return (quite likely above the single on the list) and perhaps called you to say 'hey, it's only £xx more for a return - are you sure you don't want that?'.
My only logical conclusion, which is what I am sure FCC concluded, is that you arrived at the station on the day, saw the gates open and chanced it. If that's not the case, you'll have a job proving otherwise now - unless you can get them to check CCTV records. I sincerely doubt they'd do this, and probably only two of the four TVMs are likely to be covered anyway, and even then it wouldn't show what ticket was purchased, of if it was later given to you instead of being used by someone else. And you say you didn't buy the ticket...
I'd just seek a settlement and be a LOT more careful next time. FCC catch students all the time at Hatfield, for a range of offences. They've seen it all, believe me.
I rarely take train from Hatfield, my last experience using the machines I had to get an operator to help me as i couldnt find the option for Londons, King cross so i asked my friend to get it for me, I dont see what is confusing about that point, Was i supposed to interrogate her as to the exate date and time ? (please remember all this is being said with hindsight and at the time i had no idea anything like this would happen).
and when i was speaking to the RPI i didnt actually give details of when the ticket was purchased, it was a very brief questioning because i was running late for my job interview and tried to do this as quickly as possible.
Why would i chance it when theres gates at the otherside

That doesnt make sense. Futhermore im sure i said this earlier but I SAW THE INSPECTORS on the platform at Hatfield and SAW them board my train
Its not that i knew nothing about ticket prices i had a rough idea, they were hardly gonna charge 30 pounds just to go finsbury

and another of my friends advised me that it wouldnt be much just for a train to finsbury which isnt that far.
To be honest, I dont really like your manner and tone.You weren't there therefor you cant assume what happened and i understand you being sceptical as you probably hear stories that sound odd daily but still your 'logical conclusion' is wrong.
i said earlier my reasoning for not wanting a return so please refer to that. Even on buses where i know im going back to Hatfield i dont buy returns only singles as i often take alternative routes back (ie. a different bus) so it would render the return useless.
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One word of caution to the OP:
The version of events that you are supplying is coming across as evasive and contradictory with several places where you seem to change or embellish your story. To be quite blunt it has a bad smell about it and if you come across this way to an audience that is sympathetic to your case and willing to help - please consider how it might be taken by a more hostile audience.
I remain concerned that knowledgeable people are still picking holes in your account - bear in mind that FCC's prosecutions dept know just as much (and probably more) than the folks on this forum and these type of discrepancies will be immediately picked up by them and potentially used against you should it come to court. If FCC or a court doubt what you are saying it will only make matters worse for you.
I would suggest that when you get back in contact with FCC you set out the events clearly, truthfully and completely, along with an offer of an out of court settlement, as Yorkie says there are some prior threads that can help you work out what a suitable offer may be. This is by far the best way to avoid picking up a criminal conviction that, whilst not reportable, given the profession you have chosen still carries the potential that it may negatively impact your future.
change or embellish story? This is strange as the only detail which i changed was when the ticket was bought, this is because i gave money to my friend days before as they frequently use the station and i really dislike the machines at hatfield + didnt want to queue up on the day
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How did you pay for the underground journey? Oyster or cash?
To be clear, did you meet the RPI on your southbound journey from Hatfield to Finsbury Park?
Assuming you've been taught to think like a lawyer, you must be able to imagine how this appears to the other side.
I'm also confused by your apparent inability to operate ticket machines, and also your apparent lack of familiarity with London and its transport network - surely everyone your age goes on nights out in central London?
I can only defer to the advice of others about what to do next. Once you've drafted a letter you might care to see if anyone here would read through your draft (by PM). Not me, as I don't have the right experience to be able to assist.
I paid for my underground journey by cash, i realised i had forgotten my oyster back at campus so had to pay for all my underground trains and buses at full price, which again worked out costly but as i said my main concern was the job interview not expenses on travel.
I dont usually take railway trains nor do i ever go out for nights in central london,
im not familliar with North London because i dont ever go there only south london
Some of the assumptions in this thread strike me as quite odd and it is worrying that people are so sceptical and judgemental over losing a ticket

Im not the most organised of people and i do frequently lose things (hence why i forgot to bring my oyster aswell).
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I've got an idea. You could ask your friend what date and approx time they bought your ticket.
And I have to say that I don't really buy the "as i dont know how to operate the ticket machines". Unless you've tried to use them then presumably you don't know you can't operate them. I might believe that if you are an older person who hasn't been brought up with any technology - but a uni student? Do you have a lap top, mobile phone, smart phone? Do you manage to get them to work?
Are you really comparing my Laptop mobile phone to a ticket machine.
I do not paticuarly want to be able to use a ticket machine i rarely take railway train so they are not something i need to learn to use nor are they a requirement.The last time i tried to use it last year to get a ticket to Kings cross i couldnt even find the kings cross option and had to get one of the attendeds to assist
I own a laptop, iphone 4s and a blackberry i 'manage to get them to work' because i
want to use them and use it for communication and my university work , hardly think its comparable to a ticket machine
