There is a website for Devon and Cornwall police (called Op Snap) to upload dash cam footage to them. They examine it and they say they will let me know if a prosecution is to follow. They examine ALL your footage to make sure, no doubt, that you haven't been a naughty driver as well, and to make sure that it hasn't been tampered with.
That's fair and good, innocent until proven guilty.
I cannot say how often I have sat behind a queue of thirty cars in the outside lane, sorry lane 3, to see someone running parallel to a snoozer in lane 2 which results in the morons of our world going up the underside, hard shoulder and across three lanes to get past. Its like watching a slo-mo of a youtube clip.