One, get registration of a vehicle, Two, phone 999 in hysterics claim vehicle cut you up as it was turning in and the driver waved what looked like a handgun at you. Three, Sit back and watch the fun.
I had to serve papers on a traveller camp once. The spokes ape got all indignant because the entrance to the feild had got chopped and muddy 'You'd 'fink the owner would put down some stone!' As the owner was standing behind me with the Police (Luckily, I saw a definite restraning hand) I suggested The Owner would be more than happy to bring down a Bulldozer to help them out.
A very well known demolition contractor was waitng out side a yard that traveller's had camped on. As the Twelve o'clock deadline for depature was reached he ordered all his trucks to start dumping rubble into the entrance. That was a fun afternoon!