[semanticist]

In the UK, the police have the power to stop and search, including viewing images, only someone 'reasonably suspect to be a terrorist'. http://content.met.police.uk/Site/photographyadvice

It doesn't say so there, but other advice I've seen the Met. issue explicitly states that taking pictures of a building in and of itself isn't sufficient for a police officer to 'reasonably suspect' a person to be a terrorist, and taking pictures of the police definitely isn't.

The Met. keep publishing advice telling their army of goons to leave photographers alone, while at the same time winding up said army to catch terrorists. It's a farce.

[vidarh]

Note that this advice was revised after the UK once again was slapped down thoroughly by the European Court of Human Rights, who in January 2010 ruled that the much wider stop-and-search powers granted under section 44 of the Terrorist Act 2000 were illegal.

Notice the weasel words on the page you linked, which states "The power to stop and search someone under Section 44 of the Terrorism Act 2000 no longer exists" - not mentioning that it was not merely repealed, but found to be an illegal violation of human rights.