In addition to the sound advice proffered so far, I would just like to make the OP aware (in case he isn't) that saying that someone else was driving when you actually were is viewed as a
very serious offence by the courts, far more serious than any speeding offence. If it can be
proved that you are lying (as opposed to them just
believing that you are), you are very likely to go to jail, for perverting the course of justice. There have been many examples of this in the news. You'd almost certainly get a lesser punishment for burglary, however unfair that might be.
Please don't make the mistake of thinking that because it's "only a speeding ticket" and "loads of people swap points" and "cameras are just there to make money anyway" then deliberately filling in the wrong name is "no big deal". Thinking "There's no way I'll get caught" is all very well, but that's exactly what the other jailed people thought. Once it becomes a PCoJ investigation it becomes potentially pretty thorough, e.g. you may get police turning up and searching your house (and maybe your hard drive) for documentary evidence.
I'm not saying that you are lying, I'm just making you aware of the likely consequences if you are and you're found out. Please believe me that it's absolutely not worth it. I'm all for legally avoiding contributing to the camera fund however, and if you or your mysterious and transient friend are interested, much useful advice on how to proceed can be found at
PePiPoo.
_________________
Paul Smith: a legend.
"The freedom provided by the motor vehicle is not universally applauded, however: there are those who resent the loss of state control over individual choice that the car represents. Such people rarely admit their prejudices openly; instead, they make false or exaggerated claims about the adverse effects of road transport in order to justify calls for higher taxation or restrictions on mobility." (
Conservative Way Forward:
Stop The War Against Drivers)