Interior scenes of the reinstated Irish parliament were shot in Trinity College's 1937 Reading Room for Michael Collins. And though Oxford's Bodleian has been filmed a number of times, it has rarely ended up as a library on-screen. The court bounded by the Schools Quadrangle, Sheldonian Theatre and Clarendon Building (pictured below) has been anonymized by its ubiquity. In Tinker Tailor Solider Spy, in X-Men: First Class, throughout Inspector Morse, and in Brideshead Revisited, actors cross this quad going about their business, going anywhere but the library. The surrounding seventeenth- and eighteenth-century buildings in Headington stone could be almost anywhere in Oxford. Perhaps the Library authorities are more welcoming to filmmakers than the Colleges - today a website encourages enquiries.
The Headington quarry also supplied the limestone with which Eton College and Windsor Castle were clad. Indeed, Hollywood seems that all of England's buildings were hewn from it. Harry Potter's Hogwarts library is, in fact, the Bodleian's Duke Humfrey's Library, its infirmary the Library's Divinity School. The Divinity School also featured as the lobby to the House of Commons in The Madness of King George.