Intentional intimidation

Out for our regular weekly training ride, had been putting in a hard turn on the front for a while so looked back to check the coast was clear and pulled out to roll to the back. This homicidal idiot decides to try and teach me a lesson for daring to be on "their" road, was within centimeters of me despite there not being a hint of on coming traffic.
This was reported to police, but apparently despite having the footage and the license plate there's not a lot they can do if the driver does not admit to being behind the wheel.