The great-grandmother of Samantha Cameron wrote which novel that became a famous film?

Enid Algerine Bagnold, Lady Jones, CBE (27 October 1889 – 31 March 1981) was a British author and playwright, known for writing the 1935 story National Velvet.

In 1920, she married Sir Roderick Jones, Chairman of Reuters, but continued to use her maiden name for her writing. The couple had four children. Their great-granddaughter is Samantha Cameron, wife of the former Prime Minister and Conservative Party leader David Cameron.

National Velvet is a novel by Enid Bagnold (1889–1981), first published in 1935.

National Velvet is a 1944 American Technicolor sports film directed by Clarence Brown and based on the novel of the same name by Enid Bagnold, published in 1935. It stars Mickey Rooney, Donald Crisp, and a young Elizabeth Taylor.