He acted as private secretary to William Morris, becoming a major collector of Kelmscott Press books; was secretary also to Wilfrid Scawen Blunt; and was Thomas Hardy's executor.
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Cockerell tried to patch up a quarrel between Ruskin and Octavia Hill (Hilton, p. 832), who had been a friend of his late father Sydney John Cockerell, and godmother to his sister Olive.
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The bee expert Theodore Dru Alison Cockerell (1866–1948), who settled in the United States, was his brother, as was the book binder, Douglas Bennett Cockerell (1870–1945).
Sydney | University of Sydney | Sydney Opera House | Sydney Swans | Sydney Roosters | Sydney Cricket Ground | Sydney Conservatorium of Music | Sydney Harbour Bridge | Sydney Airport | University of Western Sydney | Sydney Symphony Orchestra | North Sydney | Central railway station, Sydney | Sydney to Hobart Yacht Race | Sydney Grammar School | Sydney Entertainment Centre | Sydney Pollack | Sydney Theatre Company | South Sydney Rabbitohs | The Sydney Morning Herald | Greater Western Sydney | City of Sydney | Sydney Smith | Sydney, Nova Scotia | Roman Catholic Archdiocese of Sydney | University of Technology, Sydney | Sydney Town Hall | Western Sydney | Sydney Football Stadium | North Sydney, New South Wales |
One of the most well-remembered programmes he scored was The Best of Friends, starring John Gielgud, Wendy Hiller, and Patrick McGoohan as Sydney Cockerell, Laurentia McLachlan, and George Bernard Shaw respectively.