Captain Ranty, (his blog is fascinating, I highly recommend you check it out), here is how you get out of paying for a ticket.
Try it out the next time you receive a speeding or parking ticket. On the giroslip at the bottom, write diagonally across the slip (in red ink, this is very important), "ACCEPTED FOR VALUE", add your National Insurance Number, fill in the amount box with whatever the "fine" was, then sign it in BLUE ink. (This is also important from a lawful point of view). Most of us have been trained to fill in the amount and send it off with a cheque for the required amount. What is happening here is that they just got paid twice. The original fine is withdrawn from your National Insurance Account. Naturally, the powers that be do not want you to know that such an account exists.
There is a lot more stuff like this on his site.