I suppose we are now getting to a time where it is feasible/cost effective to monitor roads electronically for speed limits, a cash cow really but when all is said and done they only catch people who are over the limit... don't get me wrong it frustrates the hell out of me as I have recently been subject to a FPN myself but it was my car, with me in it and it was going faster than the applied limit on that stretch of road!
I spoke with an officer whilst viewing the footage of the alleged fine and he offered some advise, If I wanted to challenge the FPN I had to decline the standard offer of a fine and points, at this point I may be given a second chance offer, should I refuse this offer and go to court and be found guilty of the speeding offence is then classed as a criminal charge which sits on my record! I had no reason to believe the individual was scaremongering about the criminal record but it does put things in to perspective. 3 points and a fine is relative short term pain in comparison to a criminal record.