article_snippet: Scroll down for video .
article_snippet: Some with full permissions and authorised access, others less so. '
article_snippet: Ironically, while legitimate access takes a lot of bureaucracy, it's the more 'unofficial' shoots which take the most planning. '
article_snippet: I've had to run from some locations with a memory card in my underwear before now!
article_snippet: Not because of anything illegal, more an argument with an overzealous security guard on a building I was photographing from. '