A pane of glass fell in the Cardiff Central Library causing the building to close its doors, according to the Guardian. The library opened in March 2009 to hopes that it would be distinctive in a land of already distinctive architecture. No explanation has been put forth for why one of the glass panels shattered unexpectedly in the middle of the night.
No explanation until now. While fighting a host of the Vashta Nerada that came through a wormhole from the The Library, The Doctor and his episode only companion The Perspective (an American reality TV star) escape the creatures by climbing on top of the Cardiff Central Library. The pane of glass was broken when Perspective pressed his butt cheeks to the glass in an attempt to mock the creatures. The Perspective is then killed and The Doctor then goes on to seal the Vashta Nerada into a volume of Encyclopedia Brittanica with a dead lock. The Perspective's one time fling and fellow reality star Snacky then vows revenge and starts an organization called "Hardwood" to watch for The Doctor and other other-worldly threats. We learn later that Snacky ate herself after she was locked in a sauna while slathered with coconut self tanning lotion and Hardwood was disbanded.