Marjorie Minna Jenkins Pratt, Countess of Brecknock DBE, JP (died 24 August 1989), was a British peeress. She was the daughter of Colonel Atherton Edward Jenkins and his wife, Anna Isabella (née Schoenbrunn), the niece of Sir Ernest Cassel. She was a cousin (and life-long close friend) of Edwina Ashley, who married Lord Louis Mountbatten, 1st Earl Mountbatten of Burma.
Marjorie Pratt was related to several high-ranking members of British society. 
Marjorie Pratt was related to a Colonel, Sir Cassel, and by marriage an Earl, all of whom would be high-ranking members of society. I think this was difficult for the system because of the inference needed between these titles and the idea of high-rank. 