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All his life David was liable to erupt in sudden violent rages if upset or frustrated. Unlike his gifted father, he was a poor reader and slow to learn, and his only real interest was in country sports. It seems probable that he suffered from undiagnosed dyslexia for he was not unintelligent, as his adult speeches in the House of Lords and his surviving letters reveal, and he spoke and wrote fluent French. Described by a grandson as ‘impulsive, naïve and rather humble, with a touching idealism’,
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Mary S. Lovell (The Sisters: The Saga of the Mitford Family)