I was offered one a few years ago. It or the fine never materialised (yeah, there's an anecdote there*). A friend of mine had one after going through a red light. I've not notice any difference in his driving style.
*Many years ago I received a NIP through the post. On checking the date, time and location I saw it was on a drive home from Aberystwyth after visiting friends.
The roads there are not exactly great (they've been remade in the last couple of years and are now a joy to drive on) and I rarely got to drive fast.
The fine was for doing 38 in a 30 zone. I know that if I was driving 38 then I probably thought it was a 40 zone.
Whatever; I've always said there is no excuse for speeding and one should just suck it up and deal with it if one gets caught (
I have no time for speed camera & limit whiners).
I was offered 3 points and £60 fine, driver's awareness course costing £70, or contesting it in court.
The course would have been in Cardiff meaning I would need to take a day off work, drive to Cardiff, attend the course and drive home. That would cost a hell of a lot more than the fine and any associated insurance penalty for 3 points (most insurers don't give a crap about a single SP30).
I replied (via recorded delivery as I didn't want to take the risk of it disappearing and getting a pointless summons land on my doormat; I know they got it) to take the fine.
That was in 2006, I think.
Still waiting to hear back from them.