Cheers Stigy I thought he was just talking nonsense anyway but I'd rather have someone confirm it, compared to ignoring the threat and getting a letter through the post in a few weeks.

I received a penalty fare of £20 which I paid the same day I received. During my debrief by the Penalty Fare Officer he asked me to put a name and short address onto his little notepad so i wrote my abbreviated name and address onto his notepad, then I got out my Driver's License so he could fill in his Penalty Fare Notice with my full details. As I left the train he took me to one side and told me that because I hadn't given my full name on his notepad I was liable to prosecution. Should I be expecting a letter with a court date? I have kept the copy of the penalty fare proving that when requested i provided evidence of my full name and address.