Unfortunately the nice approach does not always work..... had a Ahole neighbour that kept blocking me or the wife in so ended up calling the police one day as he refused to answer the door and they had to get him to move it.!!!!
But it continued after so I finally lost patience as he had blocked the missus in, I had a big 4x4 at the time so just strapped the tow hook of his car to my 4x4 and towed his car to the middle of the road and left it there, never had the same problem again :).
Steve