As I've pointed out in a couple of reply's using 2 cameras, one to record your speed and one to actually take you picture is, as far as my outdated understanding of the law.. Completely illegal!!
By using 2 separate cameras they can literally do anything they want IE; take a random picture of any bike coming towards them and superimpose the speed over the top (as I said earlier - make it up as they go along) then slap any old number plate on the "here's your plate" picture.
That would NEVER hold up in court, it'd be to open to tampering!
Looking at the rear facing camera it also needs to have a clear view, no windscreen or such so a front camera is out of the question. They can turn their rear facing camera to the side window for motorway bridges but the still have to measure speed of vehicles coming towards them..
You don't have to be a legal eagle to go to court and ask the actual judge or magistrate for clarification of what the law is for any given case...
If you know the old bill are up to no good it is your DUTY to do something about it - by not doing so you are technically committing a crime yourself
Also, don't swallow any ole thing a website that's trying to sell you speed camera's gps locations tells you eh boys... Use your loaf!