"[1] Horner attended Eton College and then Trinity Hall, Cambridge, and obtained a BA degree in History and Modern Languages.
[2] According to Sarah Bradford, Sacheverell Sitwell's biographer, "At Cambridge, a male admirer addressed Horner as "Beauteous Adonis": he was pale, willowy and elegant, with a finely drawn profile and blond.
"[3] According to John Pearson, the Sitwells' biographer, "David dressed superbly, had an amusing line of gossip about all the best people, which he recounted in an engagingly basso profundo voice, and after leaving Cambridge was soon floating, as unattached, good-looking, upper-class young Englishmen could float in those more gentle, far-off days, through a rarely failing world of dinner-parties, long weekends and holidays abroad.
He was the perfect guest, the ideal ornament for any party, charming to women and agreeable to men, better connected and far better read than the usual run of gilded social butterflies, and equally at home in the best society in Paris or in London.
[2] The largest single collection of Sitwell papers is in the Harry Ransom Humanities Research Center at the University of Texas at Austin.