These include "Such, such were the joys", referenced in the Guardian article when it states: "Neither will anyone be allowed to trespass on all the material that came to light post-1950 and which Davison painstakingly assembled in his compendious George Orwell: The Complete Works (1998). This includes Such, Such Were the Joys, the notorious account of his tribulations at a character-forming Sussex prep school, first published in the US in 1952 but not issued in the UK until as late as 1968, for fear of libel proceedings."
That essay is here, and has been for a long time: