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Waterstone's Online
Well designed easy to use site just for books. Extensive library of available books plus reviews and recommendations, list of branches, out of print book search, and signed first editions.

Amazon UK
UK version of the popular online bookseller. Extensive availability of books plus audio books, reviews and much more. The Amazon offering has grown to include music, DVD, videos, software, games and more.

WHSmith
Books, magazines, stationery, music, DVD and videos, and more.

BOL
UK version of BOL including online bookshop, reader reviews, editor's choices, author interviews and more book related information. Site also includes music, DVD, videos, software and games.

Blackwell's Online Bookshop
Premier academic, professional and specialist bookseller online.