I have seen many people make such claims over the years, including a colleague at work who was adamant he got a NIP for 34 in a 30 but had to admit he was wrong after checking the paperwork.
Some people on social media get very argumentative when you don't accept what they're saying at face value, but I'm yet to see any proof.
A few years ago we had a case where someone got a NIP in Kent for something around 75 in a 70 in Kent, and when it was pointed out that this was below the prosecution threshold, Kent Police admitted the notice had been issued in error and no further action would be taken.