Question: Frances Shand Kydd's former husband was Viscount Althorp until when>
Sentence (from "John Spencer, 8th Earl Spencer"): Edward John "Johnnie" Spencer, 8th Earl Spencer, (24 January 1924 – 29 March 1992), styled Viscount Althorp until June 1975, was a British peer and the father of Diana, Princess of Wales.
Relevant evidence: Yes