Luckily I have considerate neighbours and there's a residents parking scheme in our road on weekdays due to the nearby collage. But my next door neighbour has the ideal tools for combating inconsiderately parked asshats, namely one of these
(Well, more than one actually. He teaches LR mechanics all over the world, and builds them for fun in his spare time!)
And it's equipped with one of these -
After trying the normal polite way, I wouldn't hesitate to drag the damned thing out of the way. In fact, I've seen 4 blokes pick up the back end of a Sierra and move it out of the way in London once, when I was working on Limehose Link. It's not hard......