W H Smith offers a massive range of online shopping covering books, talking books, CDs, DVDs, videos, computer games, magazines, computer accessories, stationery, and selected hardware.
http://www.whsmith.co.uk

The Real Bookshop on the web. Order from 1.4 million books in print.
http://www.foyles.co.uk

Responsible for all sales and customers through all channels in the UK market including all our physical bookshops, Blackwell's Online Bookshop and UK library supply. Browse its range of academic and professional publications and software for businesses and training establishments.
http://www.bookshop.blackwells.co.uk

Waterstone's reputation over the last twenty years has been built upon an unparalleled high street range of books, and enthusiastic and knowledgeable booksellers who are happy to recommend the best books in every field to our customers.
http://www.waterstones.com

Abebooks is the world’s largest online marketplace for books. Find and buy — or list and sell — new, used, rare, and out-of-print books online. Bookbuyers love the variety of over 50 million books offered by more than 12,000 booksellers.
http://www.abebooks.co.uk