.... as I have been taking loads of photo's recently, this caught my eye on the BBC News website.
There have been many stories of late of photographers being challenged, and at some point if you take photo's in public places I suppose a stop & search is at some point inevitable, however if anyone (even a Police Officer) asks you to delete photo's or surrender Compact Flash cards etc. - YOU ARE NOT OBLIGED TO DO SO.
This link provides a very useful 2 page PDF file for reference.
You can sign up to the Downing Street petition to stop over zealous local authorities preventing us from doing what we have done for years & years.
Sadly, advertising like this from the Metropolitan Police doesn't help. It goes without saying (or advertising) that if anyone is taking any kind of interest in noting where things like CCTV camera's are in any location it should be reported.
Some of the more intelligent and enlightened forces have adopted some aircraft spotters as another set of eyes. Even the Metropolitan Police worked with Scotland Yard & BAA a few years ago with a scheme of registration for aircraft enthusiasts with LAAS International. The MoD have just started a similar scheme at RAF Coningsby.