Nothing. What can they say, him locking his own gates isn't breaking any laws and there is no legal reason why he has to allow trespassers back onto his property to reclaim any property they've left there from a previous trespass. The moment they decided to trespass on his private land and dump their car it became a civil matter, not criminal. He has asked a few owners to cough up £50 to get access to his land so they can get their car though - a few have paid.
I copied and pasted this from another Forum that was discussing parking on private drives.
If the driveway is empty or not, as far as I'm concerned you DON'T block it OR park on it.
I live in a terrace of 4 private houses, in a cul-de-sac, all have driveways, leading to integral garages built under the individual houses.
Mine and my neighbour to my right have long driveways, capable of taking at least 3 medium to small cars, the other 2 have spaces for 1 car each in addition to their garage.
There is no dropped kerb, the driveways are level with the road.
I live some 80 metres from the Thames, very close to Tower Bridge, and a few years back, the river was full of "big ships" for a sailing race, so people were coming from all over to admire the ships.
Naturally there were a few more cars parking in the area for this, but you could still get in and out reasonably easily.
One day, during the course of my work, I found myself close to home and decided to stop for coffee.
As I approached my house, I saw a VW Passat parked on the drive, its rear bumper maybe 40cm from my garage door.
Thinking that it must belong to a friend of my wife, I parked in front of it, went in, and asked her.
She said that 2 guys put it there and were getting out, when she went out, and asked them to leave, as it was our private property, they'd said that they just wanted to look at the ships, she'd insisted, and they said that they'd leave when they were ready.
At this, the red mist started to descend across my eyes, but I thought, I'm going back to work, I'll try it legally first.
I phoned the local cops, who weren't too keen, until I told them that a breach of the peace was very likely if they didn't come and mediate.
When they arrived, they ran the plate, they wouldn't tell me, but I heard one say to his pal, "registered to an address in Nottinghamshire."
I said, "How about I pull it out with a tow rope?" They said that if I damaged it, the owner could take me to court, the best thing to do would be to wait until they returned and took it away.
I agreed, and they left.
I called a friend who had a breakers yard in Deptford, and he agreed to lend me a battered Transit van, and an ancient Land Rover, the solid metal kind.
He and an employeee brought them round, and I took them back in my car.
I parked the Transit on my neighbour's drive, (she was in Canada), about 50 cms from the side of the VW, and backed the Land Rover up, to about 25 cms from the VWs front bumper, so there was a brick wall one side of the VW, the Transit on the other side, and the Land Rover in front of it.
I then decided not to go back to work, and parked my car a few streets away.
About an hour later, the guys knocked on the door.
I had left my kid's baseball bat in clear view by the inside of the door, with absolutely no intention of using it, or threatening to.
When they asked to be let out, I just said, "Yeah, when I'm ready", and closed the door.
20 minutes later, the same 2 cops turned up, summoned by the 2 guys, they asked me to see reason, I said, "I don't think so", they just shrugged at the guys with the VW, and drove away.
I let them stew for about an hour, then moved the Land Rover.