Bah Tabitha again

! Every forum that spikes my interest has you in it. I'm not stalking you, honest :upto:
I'm a big fan of Bladerunner, but I have never been able to find a copy of the original version. Bladerunner was a little bit before my time, I only got into it because my older brother was a big fan, but he had the directors cut version. I also have the directors cut, having never seen the original for sale (well not in the two for £20 section anyway :blush: )
I heard that the directors cut changes the story quite a lot. How do they differ?