Well done Jamie for putting this together after such a long time since it happened. In case anyone's interested I have quite a lot of footage of my own shot on that day. There were exactly 350 people on the march - Andrew Bradstock counted them! Getting into one of the most heavily secured private gated estates in Britain governed by it's own Act of Parliament was a lot of adrenaline and fun. 
As the super rich buy bigger and bigger houses as an investment, squatters are squatting bigger and bigger houses in more and more luxury - hurrah! 
see also: 
The Land Is Ours website 
 http://www.tlio.org.uk and The Land magazine 
 http://www.tlio.org.uk/chapter7/ which you can write for if you wish