I really dont know much on the subject but I belive the technicalities he can look at include....
Was the camera calibrated within its set service period.
Was the NIP sent within 14 days
Is ALL of the information on the NIP correct
Demand to see a photo from the camera to help you identify the driver
Not sure now but as I understand it you used to be able to return the form with only part of the NIP signed. I really don't route at all but have heard of people using it to get off in the past.
This is probably related to the ECHR law that it is illegal to force an individual to incriminate themselves. A law which the police do blatenly flout when it comes to speed cameras.
http://www.pepipoo.com/ is the place to look for free advice.
In terms of what an actual Solicitor would do to get you off I have no idea but I have met people in London who have paid professionals and had convictions thrown out. Sure it costs them mucho £££ tho.
In terms of illegal loopholes that are easy to exploit you can sell your points to someone else to take. Or blame it on a relative abroad.
These routes of course are far more difficult to justify moraly, however if the police used actual police on the roads rather than machine to do their job it would stamp this out instantly.
Additionally to use your own words
"say we all said "stick it to the man, fight the system!"
If everyone in the next week who was sent an NIP in the post decided to go to court as a form of protest due to the unfairness of NIP's and speed cameras the system would be unable to cope and colapse