So, I finally received the letter with an SJP. It is pretty much the same as the other ones we have been seeing on the forum lately. I have attached it.
Following the advice commonly given here, I have drafted a letter.
Full disclosure, I had avoided the correct fare on a handful other occasions in the past that I genuinely regret now. I would do whatever it takes to settle it out of court now. Ideally, I would like to also avoid the interview since it is very stressful for me and I would need to hire a solicitor which is very expensive for me. I didn't stress it too much in the letter (not to give a sob story), but I have been dealing with chronic anxiety for which I am taking medicine. So I would like to avoid such a stressful encounter. Here is the draft, I would appreciate any feedback, comment, and help:
"Hello,
I am writing you with regards to the letter I received with customer reference xxx.
I would like to express my deepest regrets in my actions. I sincerely apologise and I am embarrassed by any inconvenience and hurt that I caused. I now better understand the gravity of my actions. I take full responsibility for them and would do anything to rectify them.
Ever since this incident, I have paid the utmost attention in paying the correct fare and having the correct ticket, and I assure you that I will never lose sight of that principle. Upon receiving this letter, I have looked at my Trainline history to see that I have not paid the correct fare several times. I fully understand and own up my total lack of judgement.
I am a PhD student, and it would be extremely detrimental to my future if this were to progress to a criminal conviction. I would be very grateful to you if this matter could be settled out of court. I take full responsibility and would be happy to pay any outstanding fares and administration costs, as Chiltern deems appropriate. Please rest assured that there will be no repeat of this behaviour, neither in this matter nor generally in my life.
I would like to finish by reiterating my sincere apologies and my full commitment to amend my actions."