one of the Mitford girls, sister to Nancy Mitford, Diana Mitford, Pamela Mitford, Unity Mitford and Jessica Mitford. The modern history of Chatsworth begins in 1950. The family had yet to move back after the war. Although the 10th Duke had transferred his assets to his son during his lifetime in the hope of avoiding death duties, the Duke died a few weeks too early for the lifetime exemption to apply and tax was charged at 80 per cent on the estate. The amount due was £7 million (£ as of ). Some of the family's advisors considered the situation irretrievable and there was a proposal to transfer Chatsworth to the nation as a Victoria and Albert Museum of Northern England. Instead, the Duke decided to retain his family's home if he could. He sold tens of thousands of acres of land, transferred Hardwick Hall to the National Trust in lieu of tax, and sold some major works of art from Chatsworth. The family's Sussex house, Compton Place was lent to a school. The effect of the death duties was mitigated to an extent by the historically low value of art in the post-war years and the increase in land values after 1950, during the post-war agricultural revival, and so on the face of it the losses were much less than 80 per cent in terms of physical assets. In Derbyshire were retained out of . The Bolton Abbey estate in Yorkshire and the Lismore Castle estate in Ireland remained in the family. Still, it took 17 years to complete negotiations with the Inland Revenue, interest being due in the meantime. The Chatsworth Estate is now managed by the Trustees of the Chatsworth Settlement, established in 1946. The 10th Duke was pessimistic about the future of houses like Chatsworth and made no plans to move back in after the war. After Penrhos College left in 1945, the only people who slept in the house were two housemaids, but over the winter of 1948–1949 the house was cleaned and tidied for reopening to the public by two Hungarian women, who had been Kathleen Kennedy's cook and housemaid in London, and a team of their compatriots. The house was Grade I listed in 1951 after the passage of the Town and Country Planning Act 1947. In the mid-1950s, the 11th Duke and Duchess began to think about moving in. The pre-war house