Here's another bit of legislation that Photographers 'could' fall foul of.
Section 76, Counter Terrorism Act 2008
Basically it is an offence to to elicit, attempt to elicit, or publish information "of a kind likely to be useful to a person committing or preparing an act of terrorism" about
a member of Her Majesty's Armed Forces,
a constable,
the Security Service,
the Secret Intelligence Service, or
Government Communications Headquarters.
Fine is unlimited and up to 10 years inside.
Now I don't think anyone has been prosecuted for this Offence yet, but it onlu hit the statue books in 2009.
It looks quite draconian at first glance, but it allows a defence of 'reasonable excuse' in that is a defence for a person charged with this offence to prove that they had a reasonable excuse for their action.
What is a reasonable excuse? Good question and I don't think it has been tested in Court, though I suspect taking photographs of Police Officers in public order situations or to highlight corruption cases both by the media and public would be covered by 'reasonable' excuse, as would taking photographs of Armed forces staff at Parades / Changing of the guard etc.
I suspect if you're taking photographs to assist terrorism or that could potentially compromise anyone of the above groups by exposing them to a terrorist threat then I suspect it wouldn't fall into the 'reasonable' excuse category.
Interestingly enough, PCSO's do not fall under the umbrella of this legislation because they do not hold the Office of a sworn Constable (Special Constables do).