It looks like it's a common problem in Waterstone's... Went into Waterstone's in Reading today to buy the book. I was told that it's in the Biography section and they have 5 copies. After 10 minutes of searching I wasn't able to locate a single one. Two shopassistans were looking for the books for another 15 minutes when I gave up. Luckily Reading has another Waterstone's, which was a bit more organized. Nice work Tom!