The Guardian view on surveillance after Paris

This week has not reset the basic arguments about security and privacy. Britain still needs the debate that the agencies would rather not haveWith two hostage crises playing out in parallel, one given an especially sinister dimension by the targeting of a kosher supermarket, today’s pictures from Paris underlined a jihadi threat that is ugly and real. Before the standoffs reached their bloody climax, it was reported that one of the Charlie Hebdo gunmen had trained with militants in Yemen. A li