Written/ Verbal Warnings?

Thanks Wiretwister, like I said, no notification or anything just got handed a letter and that was it. I just wanted to check about the stages of getting a written warning.
I’ve been in today and said my bit, plus extras when I started getting annoyed, and told them I would be taking it further if they didn’t retract it. What’s annoying me is I haven’t driven it since august 2004 and it was OK then or I couldn’t have pulled the drawbar trailer with it. Which when I’ve checked my diary I was doing the last time I drove it.