Neighbour disputes of any kind are the worst possible nightmare.
Before you even think about getting into any legal aspects of your neighbour's actions, you need to try and sort things out betwen yourselves. This will avoid a war of attrition which is unpleasant, and expensive.
Next time your neighbour blocks your car with his motorbike, knock and the door and REALLY politely ask him if he could please move it so you can get out, and do that every time he does it until he gets sick of being silly and moves it anyway.
If he fails to do so, ask him, again REALLY politely if there is a problem, and you hope you can both sort it out together. This may work, but if he is determined to b e bloody-minded, then you might have to resort to legal advice.
However, that should be your absolute last resort, when you have nothing what ever to loose in terms of goodwill.
Hope you can sort this out.