I'd like to add something about the Broadwater Farm estate. Whilst I can't say anything about Mark Duggan and his involvement with the police, the estate is notorious for trouble. Although on the news they mention the riots and murder of a police officer in the 80's, as far as I am aware, another police officer was also murdered in the estate just a few years ago. He was answering a call by himself at the estate, and was ambushed, then beaten and killed. For this reason, the police won't actually go into the estate unless they are heavily numbered / equipped and there is a lot of fear in the surrounding area of the estate and it's residents. As the police don't often service the area, the criminal element in the estate has grown and grown. I personally won't go within a mile of the area, and that was before the events of the weekend.
This has lead to serious problems in the area and it's vicinity between the police and locals. The police are noticeably tougher and have more attitude when dealing with crime and residents of this area, and as a result, the residents have a more confrontational and aggressive attitude to policing in the area. That's why the initial riot on Saturday in Tottenham was to a certain extent "waiting to happen."
What's needed long term is some sort of urban rejuvination project. I live in Wood Green these days, but 20 years ago, if you asked me if I wanted to live there, I would have told you that I would rather live in a sewer, such was the bad reputation of the area. However, millions were spent upgrading the shopping mall and high street and as a result, the area is actually fairly pleasant. Or at least I thought so until the twats and morons who also populate the area and it's surroundings decided to riot.
Of course with the economy in tatters such investment is a pipe-dream. It means such areas are going to remain as shitholes and the problems associated with them will just increase.