Not sure which building this is but it should be noted that parts of the site are reported to be contaminated with asbestos,
" The Atmosphere at this point is highly contaminated with Asbestos dust, making suitable breathing masks essential. All surfaces ( look on the floor, in the picture! ) are covered with asbestos contaminated debris."
http://www.subbrit.org.uk/rsg/sites/b/bempton
Martin