There are a number of potential defences and loopholes to look at to see whether you can succesfully defend a speeding ticket. These are sometimes described in adverts as driving secrets. Remember, there is no such thing as a 100% guarantee that you will escape a speeding fine or conviction if you are guilty!
I was not the driver
If you were not the driver then you are not guilty of an offence. However, if you were the registered keeper then you are required by law to return the Notice of Intended Prosecution form with the driver's details. Failure to do so is an offence punishable by six penalty points on your licence. The authorities will then contact the alleged driver who will then be prosecuted.
I don't know who the driver was when it was caught on the speed camera
You are required to make every effort to discover who the driver was. This may involve checking fuel receipts, phone records etc of those people who could have been driving.
It's a company van and I don't know who was driving
You are required to make every effort ("reasonable diligence") to find out who was driving at the time of the alleged speeding offence. As an employer you are required to check the licences of those people who you allow to drive the vehicle.
My wife and I shared the driving and I don't know who was driving at the time
This defence was successfully used by Neil & Christine Hamilton. Again you must make every effort to find out who was driving at the time of the speeding offence.
I genuinely wasn't speeding
Ask to see the police photos/video from the speed camera equipment
Important note. Do not lie to get out of your speeding ticket - it can lead you into more trouble. See this case from the Midlands
More speeding defences >>
Mitigating Circumstances >>
Illegal Cameras? >>>