 In 1963 Faber and Faber reissued Jill, with the addition of a long introduction by Larkin that included much information about his time at Oxford University and his friendship with Kingsley Amis. This acted as a prelude to the release the following year of The Whitsun Weddings, the volume which cemented his reputation; almost immediately after its publication he was granted a Fellowship of the Royal Society of Literature. In the years that followed Larkin wrote several of his most famous poems, followed in the 1970s by a series of longer and more sober poems, including "The Building" and "The Old Fools". All of these appeared in Larkin's final collection, High Windows, which was published in June 1974. Its more direct use of language meant that it did not meet with uniform praise; nonetheless it sold over twenty thousand copies in its first year alone. For some critics it represents a falling-off from his previous two books, yet it contains a number of his much-loved pieces, including "This Be The Verse" and "The Explosion", as well as the title poem. "Annus Mirabilis" (Year of Wonder), also from that volume, contains the frequently quoted observation that sexual intercourse began in 1963, which the narrator claims was "rather late for me": this despite Larkin having started his own sexual career in 1945. Bradford, prompted by comments in Maeve Brennan's memoir, suggests that the poem commemorates Larkin's relationship with Brennan moving from the romantic to the sexual.
