I've scrounged around for an American list, and found a top ten list based on interviews with 125 top writers.
1) Anna Karenina by Leo Tolstoy
2) Madame Bovary by Gustave Flaubert
3) War and Peace by Leo Tolstoy
4) Lolita by Vladimir Nabokov
5) The Adventures of Huckleberry Finn by Mark Twain
6) Hamlet by William Shakespeare
7) The Great Gatsby by F. Scott Fitzgerald
8) In Search of Lost Time by Marcel Proust
9) The Stories of Anton Chekhov by Anton Chekhov
10) Middlemarch by George Eliot
I've only read five of these books, which means I'm illiterate. How about you?