Although I (Jan) purchase most of my books as ebooks, I still visit bookshops and buy p-books (paper books) from time to time. My favourite bookshops in London are Waterstones in Piccadilly which is the biggest bookshop in Europe and Watkins Books which has the largest collection of books on spirituality, wisdom and personal development. (read below about Watkins Books). It has a restaurant on the fifth floor with a great view of London.
Waterstones bookshop in Piccadilly, London W1J 9HD
Over the years of travelling, I also visited many bookshops all over the world and these are my favourites.