As the UK chattering politicians post-Woolwich push for the "snooper's charter" bill to be reintroduced Denmark reports data collection is not that useful:
...five years of extensive Internet surveillance have proven to be of almost no use to the police. Session logging has caused serious practical problems....The implementation of session logging proved to be unusable to the police; this became clear the first time they tried to use [the data] as part of a criminal investigation
Link:http://techpresident.com/news/wegov/...igital-privacy

Back to the UK debate. An IT expert's thoughts:http://www.eradar.eu/2013/05/communi...t-opportunism/

'Naked Citizens' is a short twenty-five minute film on surveillance; it is not obsessed with:
..With one camera for every 14 people in London...
It starts with a good explanation of 'smart' CCTV identifying aberrant behaviour, but then becomes more strident. Anyway some interesting concepts are explained, notably suspicion, anonymity and privacy.

Link:http://www.journey.webbler.co.uk/?lid=65226&bid=2