From Graces Guide
Note: This is a sub-section of Saunders-Roe.
"The Saunders-Roe Duchess also known as the model P.131 was a British design for a large jet-powered flying boat from Saunders-Roe, based in Cowes on the Isle of Wight. The Duchess was designed to follow the propeller-driven Princess."
Sources of Information