Just as an aside, on my first day at Sandhurst in 1956, the new intake in my company - some 20 of us, as I recall- was lined up in single rank and the Company Sergeant-Major walked along, asking each where he had been to school. The better known public schools (Eton, Harrow, Wellington, Radley, etc) merited a shrug, lesser known boarding schools an indifferent, wordless glance, grammar schools an obvious sneer, but my "Christ's Hospital, sir" was acknowledged with one word "Excellent." I never understood why and, of course, I was too terrified of him to ask for an explanation. An Old Blue had very recently won the "Sword Of Honour" so perhaps that had something to do with it.
David