the bloke is a scammer, if you go with heavys, he will have the cops there in 5 mins, claiming that you are threatning to kill him, then you are in the poop, u got two roads, legal throught the count courts, but if he goes bankrupt then then court orders mean nothing, or mess up his life and become the biggest pain ever, if there was no way of you getting your money back this is what i would do, never lay a finger on him or threaten him just park out side his house, not illegal, follow him not illegal slash his tryes, hard to prove it was you, the best report his car stolen, and when he gets pulled even if he has all the doc, they will still impound the car, and a min of 140 to get back, get a mate and block his vehicle in on his drive if he has one, as not illegal to block someone leaving a drive only illegal to block someone entering the drive, and 2 really good things i have used is xmas eve, turn his water off and put quick drying cement down there, soild by the time, they find out, and the other is to get a bird to knock on his door when hes not there pretending to be shagging him behind his wifes back, always goes down a treat, used this on a bloke who done a runner from a house he was renting off me, left it a few months and found out where he was living
(i use to be a plumber in liverpool and would always come across people trying to run scams)