Moab Is My Washpot (published 1997) is Stephen Fry's autobiography, covering the first 20 years of his life.
In the book, Fry is candid about his past indiscretions, including stealing, cheating, and lying.
In that work, public schoolboy Adrian Healey falls in love with a boy called Hugo Cartwright; in the autobiography, 14-year-old Fry becomes besotted with 13-year-old "Matthew Osborne".
Wodehouse fan (having written a foreword to a "Best of" compilation of his works, and having played Jeeves in the British comedy series of his works), was probably inspired by a quote from Uncle Fred mentioning Pongo Twistleton's exploits in the novel Uncle Dynamite: "Pongo," said Lord Ickenham, "is in terrific form.
I ask if the pseudonymous Matthew, with whom he eventually achieved some form of splendour in the long grass, had been in touch since the book came out in 1997.