Berwyn, this article is bang on. The law and 'freedom' to photograph is quite clear and it is difficult for anyone to stop a photograph being taken in a public place
I recently had an altercation with an over-zealous security guard at a prominent Cardiff public building and was threatened with the police. I told him he'd best call them then
Result?? A bollocking for the guard from his (obviously more switched on) boss and some nice photgraphs of a set of railings for my project!!
I have a copy of some 'advice' on photgraphing people and buildings in public places and I'll try to dig it out to post on here
Makes interesting reading