I HAVE RECEIVED A PARKING TICKET BUT THREE DIGITS OF THE REG NUMBER ARE MISSING, PRESUMABLY BECAUSE THE ENFORCEMENT OFFICER WAS IN SUCH A RUSH TO 'GET ME' OBSERVED AND BOOKED IN THE SAME MINUTE. THE ENVELOPE WHICH THE TICKET WAS INSIDE SAYS 'PHOTO TAKEN'. DO I HAVE GROUNDS NOT TO PAY ?

Look at the back of the ticket where it gives the appeal procedure, you should certainly also have the right to see any photographic evidence.