My BFF has been raving about this little bookstore in East Finchley ever since she moved there, and I happily let her escort me there recently to check it out. It is superb. Books falling off tables, War and Music sections intermingled, beautiful old copies of Byron for £100 a pop. Its the kind of bookshop I could spend hours in. I was a bookseller in a previous life, and very much miss the smell and feel of a shop full of real books. Very much recommended if you are a book lover and in the area.
They don't seem to have a website but you can find them at:
121 High Road
East Finchley
London N2 8AG