Waterstones and Foyles are the two major bookstore chains throughout London, with Waterstones also having a large presence throughout the rest of the UK. The Waterstones flagship store is located in Piccadilly Circus and the Foyles flagship store is in Charing Cross. Both are lovely, large bookstores, have friendly staff, and café/dining options on site. They are also both open late (until 10 pm and 9 pm respectively), save Sundays when they both close early. These are nices place to spend an afternoon, particularly on a rainy day.