Birthca 1888, St John’s Wood, London
Notes for Dorothy Powys Stone
There are 7 Dorothy Stones born in London between 1887 and 1889 and none in Marylebone, so I cannot identify her birth.
In 1901 she was boarding with her sister Enid at Ravensfield Cottage school, The Burroughs, Hendon and it gave P as the initial of her second forename.
In 1911 she was with her father and her stepmother in the isle of Wight and clearly named Dorothy Powys Stone.
FreeBMD has over 40 marriages of Dorothy Stones from 1916 to 1949. Of these 5 are Dorothy P Stone. So I cannot identify her marriage, if any.