Tania Henzell
From The Arthur Conan Doyle Encyclopedia
Tania (née Humphrey) Henzell (born 27 april 1966) is the great-granddaughter of Geoffrey Bromet (the husband of Lena Annette Jean Conan Doyle, 5th child of Arthur Conan Doyle), so he is the step-great-great-granddaughter of Arthur Conan Doyle.
Tania Henzell is the designer and producer of the Sherlock Holmes Tartan.