Many thanks for your letter dated  of Reference  and offering me the opportunity to reply back to you.
On [date], I took a train from West drayton to Shepherd Bush. I did not touch in when I entered the station as I was running very late and I had to give the presentation to the client. It was a new client and I was quite nervous in the morning due to that.
When I come out at the Shepherd Bush station, I also used the wrong card and that was because both the Oyster card and tesco card were in the same pocket. Once I was stopped by the revenue inspector, I realized that I used the wrong card. I did show my registered Oyster card to the revenue inspector and it did have enough money to cover the cost of travel. I immediately realized my mistake and apologized to the inspector. I would also like to offer you my sincere apologies for my actions on [date].
I spent most of my time on train and tube to prepare for my presentation to the client and I seriously apologize for my absent mindedness on the morning of [date].
I am extremely fearful of the potential consequences on my current and future employment as I work in information technology and they take criminal conviction very seriously.
I am also extremely worried about the impact of me having a criminal conviction on my record to the extension of my wife's visa as criminal conviction is taken very seriously.
This incident made me extremely worried and stressed and I would like to take this opportunity to assure you that I am feeling deeply ashamed and embarrassed with the whole situation. I am so sorry and I am disgusted with my behaviour on this occasion. I certainly learnt from this experience and I again reassure you that I will never ever let that mistake happen again in future.
I think of myself as a valuable part of the community and I would like to give back to community by providing my voluntary services to the charity of your choice.
I pledge you to allow me to make the necessary compensation to your company, therefore If possible, I would like to remedy this situation and avoid it being escalated further by way of an administrative settlement. I would like to offer payment of the appropriate outstanding fare and to cover any additional administrative costs you have incurred, due to my poor actions.
Look forward to hearing from you soon.