Free Traffic Legal Advice

I know this is all irrelevant but figure I'll include it anyway:

Until 5 months ago, I had a completely clean license. I then received 3 Nips in quick succession (all for driving on the M4 in newport at between 52-57 mph in the 50 zone on the M4). One resulted in a speed awareness course, and I got two lot's of 3 points. Then in February, I received another NIP for driving 57mph in a 50 this time on the M5 in worcestershire - another 3 points.

I now drive very cautiously, and ensure not to push my speed, so I was very surprised to receive another NIP in the post yesterday. Again, for driving at 57mph in the 50 zone in newport (at 6:30 am on a sunday - not that it really matters!). Now, I doubt I could argue with average speed cameras - but I do recall the journey, and recall sitting at 50, and even remember feeling slightly relieved as I got to the end of the zone (because it's quite hard keeping your speed to 50 on a deserted motorway). To say I'm gutted is an understatement, and whilst I get the law is black and white, it kind of feels a bit remiss that such small margins are being pursued, and resulting in a possible ban - is that really in the public interest?

Obviously, that's not an argument I can win... so realistically, what are my options? Complete the NIP, wait for the summons - then what? I'd struggle to prove exceptional hardship - I run my own business which does require me to attend client meetings, but I understand that isn't really exceptional hardship. I do have a family (3 kids) - but my wife drives (although she works long hours), so arguing that they can't get to clubs and events isn't really valid. Is this a lost cause?