Unmarked white van. Pulled out in front of me near Stonehaven doing 10mph less without signalling. Hazed me with his fog lights before eventually pulling in again, then pulled out quite deliberately as I passed, and kept trying to push me over into the barrier. Held my nerve and got by him, so then he followed me with headlights blazing until I pulled off at my junction. Watch out for this psycho!
Forget my previous comment. Just discovered that registration is fake!