My recollection of the law in the area is a bit hazy, but I think it is an offence to block someone from getting to the highway, but not getting off it (daft as that may sound).
So if you can't get off your drive you could call the Police.
However, it doesn't sound like that happened, so you are left with diplomacy for now I think.
I feel very bad for you as on the few occasions this has happened to us at home I've found it incredibly irritating. It is unbelievably selfish.
Sounds like the bloke is a complete tool. He obviously doesn't want his wagon outside his place and doesn't have the decency to care that you would feel the same.
If I was in your shoes I would persevere with speaking to him. If you keep on at him he's likely to get bored of fobbing you off. If you do it without losing your temper he might just stop rather than having to deal with you. The alternative is he'll get aggressive and you can then speak to the police about his behaviour.
Hope you get it resolved as I'd be furious in your position, so can empathise. Best advice is to keep your cool.
