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Big Issue seller Steven jokes as he sells the magazine in the street near Charing Cross in central London on February 14, 2012. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Big Issue seller Steven jokes as he sells the magazine in the street near Charing Cross in central London on February 14, 2012.  AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)