I was robbed at knifepoint on Oxford Street at about 3am while drunk, and let me say, there had to have been about 100 cameras pointed in my direction at the time of the mugging. Despite all this, the police told me nothing could be done because they were unable to acquire any useful footage at the time of the robbery. I lost a lot of faith in the Met after this incident, or that mass CCTV was even really that useful in getting a prosecution.