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The ones that are linked to a central control room are very much local efforts, with some spotty security guard sat watching them.

If some future government did decide to cross the line, it would only take an evening of direct action to disable all the cameras in the country.

One time you do always get cameras being used for political goals (although in an inverted sense) is when there's been a big protest in London: the organisers always say 500,000 people turned up, the police and government always put the figure nearer 43, twelve of whom were bewildered tourists who thought it was the queue for Madame Tussaud's, and all the congestion cameras which could settle the issue one way or the other turn out to have been switched off "for operational reasons".

Peter