PaulF's reply to my mind is more of the frustration of a being fined at 5 mph above the speed limit - and yet probably he was perfectly safe at the time of the ping. Depends on what we actually see as to whether we decide to prosecute or not in lower margins above limit. Think that is the difference - and we find the little quiet chat usually gets the message across that 35 mph in an urban/residential is not such a good idea.
After a fourteen day period - some of these people were not aware of the speed error and all they are apparently learning from a fine for "low infringement of the the law" is resentment which then rebounds on us. Better to tell them at time of the offence, decide on tick-off, advice, or fine at the time, and we stand a much better chance of changing attitude if this is indeed the whole ethos of partnerships. By the way - we never set any traps near a speed limit change and we make sure our cars and the one camera van are very visible and legally parked at all times.

But we do have stealths larking around as well. Seems to work here.
ANPR? No problem there - they are an extra tool - and we usually find the illegals cause most of the problems on the road anyway - afterall if they have so little respect for paying their dues - they have little respect for any other road user in any case. We tend to blitz this type.
Site, as you have correctly discerned cam op man, is not about driving at any old speed - it's about driving at the correct speed for all road traffic conditions - and a genuine concern that a single focus on one area of road safety is not such a good idea..
But I can understand frustration and anger - most customers are naturally a little upset when pulled.

You just learn how to deal with it calmly and professionally without causing further upset.