I was blocked into my own drive once, so I called Plod and they said they couldn't actually move it (can't remember why now - a few years back) so if they can't smash windows then for sure we can't ( I bloody felt like it). Unless some kind of emergency, of course.

They did however knock on some some doors in the road and found the inconsiderate owner and told him a slight porky that he would be towed away if he didn't move it. It never happened again, luckily.

English law, so maybe slightly different.

I noted that you accepted the caution. Not always a good move that, but we do things like that when under pressure and emotional.