When I was there, I bought two books. This is smaller than my usual book buying volume because I was also traveling with an iPad loaded with reading material. As much as I like the iPad, there is still something very satisfying about holding a "real" book, turning its pages, and getting ephemeral whiffs of its paper and ink.
The books I bought for airplane reading were Jennifer Kloester's long and detailed biography of Georgette Heyer and Sarah Bradford's short and breezy biography of Queen Elizabeth II.
The Heyer book was dense with information about one of my favorite writers. Back in the day ... I spent many enjoyable hours reading most of Georgette Heyer's books. And, from time to time, I enjoy reading them again. Georgette Heyer wrote elegant and witty romances and mysteries. Her period pieces are charming and often comedic. I loved them in my youth and still do. So, while reading the biography, I learned when and where she wrote each of her books, which enabled me to recall and enjoy them once more. This is a book to savor and read slowly with lots of pauses to dream about her characters, stately homes, and Regency fashions.
P.S. These books are available for purchase via my "bookshop"' at Amazon, which appears at the top of my blog page. ;-)