FFS, how many times do I have to post this for forum members to understand it?
Put the non-emergency number for your local Police force on your mobile. In Lancashire it’s 0845 1 25 35 45. When you see bad driving, ring them and tell them you’d like them to take a report. As long as the reg, colour and make correspond they will tag the report to that car and when it is next seen by a patrol car equipped with ANPR the driver will be stopped for a chat and a producer. It may well be that there are reports already logged against that vehicle; if there are three or more the driver will get a home visit and risks having the car confiscated. We have dealt very effectively with three habitual speeders in our street in this way – they don’t speed any more.
Lancashire Police encourage people to report bad driving and I’m sure many others do as well.