"Almost everyone - secular or religious, radical or conservative - believes in censorship at least some of the time. So debates about banning and proscription always turn on substance and degree. Next week, a project devised by London Libraries - with partners across the country - will give us a chance to sharpen our perceptions and clarify our ideas. The 'Banned Books' reader promotion will present 50 titles that for one reason or another have fallen foul of official censorship."

