I have had four speed camera encounters in recent years, and have walked away from each one with no fines and no points on my licence and here's how you can do the same......
1. Like all corporate bodies, they have an income v outgoings budget which means if it costs them over a certain amount to pursue you, they have no alternative but to drop the matter, so point one, is write back to them, and keep writing back to EVERY response with another question!
2. Ask for the camera's "Certificate of Calibration". They will write to you and tell you the camera is "auto-calibrated". This is bullshit as it needs a human involved to test and approve the calibration therefore no camera can be legally "auto-calibrated". So write back and refuse their explanation on these grounds and again demand a current certificate of calibration. (This advice was given to me by a solicitor and confirmed by a friend who works inside the court system!)
3. If you are caught by a "mobile" speed camera, write and ask again for the camera's certificate of calibration, and then in your next letter, tell them you believe the camera operator was moving and that the camera was being "panned". Evidence has shown that if the camera is moved even slightly it can clock a brick wall doing 30 mph!! If they continue to pursue you and threaten court action, inform them that you will require the camera officer to be present in court for cross-questioning on the panning issue. This way they will have to fund the officers wages whilst taking him "off the road" for a day. Usually the case will be dropped at this stage as was mine!
4. NEVER fill in the forms they send you asking for you to confirm your name, address and date of birth and do not sign these forms. Many people do this so that they can fill in the "mitigating circumstances section" but once you do this, you have entered into their contract and thus joinder.
Remember, the more letters you write, the more they have to reply which takes manpower, time and direct costs to them. They are a "for profit" company making money out of you for themselves and the government, don't get sucked in!
Ross