snailracer
Über Member
A penalty fare is offered at the discretion of the ticket inspector - if not offered, or refused by the fare evader which is likely what actually happened, it then it goes to criminal court. And that is just for fare evasion, never mind the trespass....
Your last paragraph makes no sense at all. The most likely punishment would be a penalty fare.
http://www.tfl.gov.uk/assets/downloads/tickets/fare-evasion-prosecution.pdf