Leading security expert Bruce Schneier writes in the Guardian:
Since 9/11, there has been an increasing war on photography. Photographers have been harassed, questioned, detained, arrested or worse, and declared to be unwelcome. We’ve been repeatedly told to watch out for photographers, especially suspicious ones. Clearly any terrorist is going to first photograph his target, so vigilance is required…
Full article, with links here.
A PDF on UK photographers’ rights is here.