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In 1976 Haskell, who often served on advisory committees for museum loan exhibitions, joined the National Art Collections Fund committee and became one of its most vocal members, defending the purchase of Poussin's Rebecca and Eliezar for the Fitzwilliam Museum in Cambridge (the government refused to accept the painting because it had been in the collection of the disgraced Anthony Blunt).
After a huge public appeal the Madonna of the Pinks was bought in 2004 by the National Gallery from the Duke of Northumberland for £34.88 million, with contributions from the Heritage Lottery Fund and the National Art Collections Fund.
The cup was acquired by its present owner, the British Museum, in 1999 for £1.8 million, with funds provided by the Heritage Lottery Fund, National Art Collections Fund and The British Museum Friends, to prevent its going abroad.