I decided to go to court and plead guilty, I had to pay £170 in the end. I wasn't prosecuted with anything, but I've well and truly learnt my lesson. I will never be so stupid to make a mistake like that again and I'll always have enough money on my own oyster! I'll be warning anyone and everyone considering avoiding paying their fare whether its intentional or not. Thank you so much to everyone who gave me advice, it really did help.