Even over Zoom, Harrington and Jay are lively company, fizzing with passion for what they do. Understandable, since it essentially amounts to treasure hunting. The pair scour the globe, keeping their eyes peeled for literary gold. ‘You go through an awful lot of rubbish to find the gems,’ chuckles Harrington. ‘I was at a fleapit book fair once and found a funny old volume mixed in with the new books. It turned out to be a 16th-century book on navigation — only a few copies known. I ended up selling it for £30,000.’ Small fry compared with his most prized find: a history of the American Revolution, signed by George Washington, which fetched more than £5 million. ‘“Association copies” [a copy owned by someone linked to the book] excite me the most,’ Jay says. ‘We handled Sylvia Plath’s edition of Dylan Thomas’s poetry — full of her notes and underlinings. That book was part of the process of her inspiration.’