I love material about writers and their process. Even academia is about a creative process so this is not entirely unfamiliar territory.
For me the most interesting material is the set of five notepads (c 2006-08) that contain Ballard’s notes for an unwritten novel that had the working title An Immodest Proposal or How the World Declared War on America, in which a global coalition has reached the end of its diplomatic patience with America’s imperialism and makes a pre-emptive strike against it. It’s great seeing these gaudy, spiral-bound notebooks with “The Book Store, Shepperton 80p” stickers. Even better are some of Ballard’s doodles on the front of a High-Rise typescript, and intriguingly, and also against type, there are notes for a children’s story, The Mirror.