The library was one more essential in the parade of rooms in a big 18th-century house - and part of the required kit ever afterwards. The important thing was to have the books, not actually read them.
Global new money has houses everywhere, and serious helicopters, it doesn't aspire to the Miss Marple life of St. Mary Mead.
The old process of social assimilation used to be mainly about English new money - generated in London, the mucky, brassy North or the colonies - buying those houses and restoring them, and doing the three-generation thing, mouldering into the landscape, and the 'community,' identifying with the place in a familiar way.