I don't think the instances which have occured over the last few days will have a long term detremental affect to the pereption of the UK and specifically London.
These riots (whether those involved know it or not) are about the current economic climate. Something like this was bound to happen with the actions of the government to cut back spending, and with a lot less jobs out there.
Students use rallys to protest. Others use marches. The inner city deprived areas gain their voice through social unrest. This is not me condoning the actions which have occured, just trying to comprehend it. In my mind these actions are the inner city youths at breaking point through having no work, no money, and no ability to resolve it. It is a pressure release, and a cry for help. As such, they will have no affect on the games next year, or on inward investment.
Many will not agree with me. And to re stress, I do NOT condone the actions which have occured. And I hope that this all dies down very very soon. But by only referring to is as mindless criminiality will not resolve anything, and only lead to a much greater problem further down the line.