Probably not the first time I've written a blog about this composer, born in England but by his own account- and not just for eccentricity, I would say!, but out of family and other forms of identification also...- Parsi-Sicilian. (1892-1988) (Neither is there much especially 20th-century "British" about his mature music, though it combines a number of other influences fairly smoothly.)
Some information about Sorabji in an interesting 2003 article
here.
Aside from having a Sorabji score in manuscript photocopy I was once asked to make a new edition from (but these years later, have not... erm... well... I've been re-reading a volume "Sorabji: A Critical Celebration", edited by Paul Rapoport and full of letters by, articles and information about, the composer. Great stuff...