its shit now.. you used to be able to just drive off shout abuse and never get a ticket! now they can send them on by post to you!
there is however a reasonable chance you would get away with it.. as there is no actual proof that it was your car.. the person could of written the plate dont wrogn.. or the car could be cloned.. with out photo evidence you would have a reasonable chance of getting off.. however most people just pay the fine as its easier (and they were in the wrong! )