I and my neighbours did something similar once Androcles. I use to live in a cul-de-sac of 7 houses and one guy used to insist on parking his car on the road and not on his drive, and if any of the other neighbours or their visitors managed to park in front of his house when his car wasn't there, upon his return he used to go to the house of the car owner, and if it was a visitors car, would go from house to house until he found out which house was being visited.
He used to get most upset.
Now, obviously, everybody pretty much always told him to eff off, but after a while his constant moaning got up everybody's noses.
So, I and the other neighbours clubbed together and bought an old banger, taxed it, insured it and MOT'd it, and when this guy went out one day, we parked it in front of his house and left it there for months. He didn't know it was us and, because the car was pefectly legal and legally parked, there was aboslutely nothing he could do about it.
Within six months his house was up for sale.
Granted it all sounds a bit petty.......but we all got an enormous amount of satisfaction out of it.