Doctor Who: 10 Things You Didn't Know About The Weeping Angels
4. They Were Originally Meant To Be In The Library Episodes...
Blink was written for the third series of the Doctor Who revival, and for the fourth, Moffat's contribution was two-part story Silence in the Library/Forest of the Dead, the episodes that first introduced River Song.
These episodes also introduced the deadly Vashta Nerada, carnivorous shadows that consume the flesh of their victims. Originally though, this wasn't the case, and before coming up with the Vashta Nerada, Moffat was planning for the Weeping Angels to be the villains of the story.
However, when the opportunity to write Blink arose, Moffat needed a monster, and so, he pulled the Angels from the library and plonked them in that sinister, derelict house.
Looking back, it's easy to imagine the Angels being in the library, because it's a very dark and tightly-packed location, the perfect place for the stone assassins to strike.