the laws on hypothecation changed earlier this year so there is now no compulsion for signs with the camera logo to be shown, nor in fact is there any requirement to have the fixed cameras sighed or even painted yellow.
There are some signs to look out for, usually circular with a red border, and a number in the middle of them. Use the biological CPU to compare that number with the number on your analogue velocity reporting device - keep the one in the red circle higher than the one the analogue pointer indicates and you will be fine.
With regards to the S172 defence - if you can truthfully show due diligence and cannot identify the driver, it is safe to use. If you are trying to swing the lead, that's a little thing called "Perverting the Course of Justice". PTCOJ is tantamount to pi**ing in the court's party ... they really don't like that, and the penalties are MUCH higher. Including incarrceration (that's prison, by the way). Sending in that letter WILL result in a court appearance, where you WILL be asked to prove the statement. Your friends named in the letter will also be asked to back you up - under oath, so you will be asking them to commit perjury. Well done, not only you going into clink but them as well. Some mate you turned out to be.
If you WERE speeding, pucker up and take the fine. If you think it's questionable, do NOT pay one of the people who advertise on eBay for "guaranteed not guilty", as they charge you for the same advice as you can get from www.pepipoo.com for free. Pepipoo is the best source of advice, they will be honest and tell you if you have any valid defense.
In the meantime, there is no point in worrying about it until a NIP (Notice of intended prosecution) arrives.
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