A dramatic battery of measures to prevent radicalisation of British Muslims was outlined on Sunday by the home secretary, Theresa May, including tougher pre-emptive censorship of internet sites, a lower threshold for banning extremist groups and renewed pressure on universities and mosques to reject so-called hate preachers.

May also signalled that she was prepared to do battle with Nick Clegg, the deputy prime minister, over his veto of the communications data bill.

After four days in which ministers have been praised in some quarters for avoiding a kneejerk response to the killing of soldier Lee Rigby outside his Woolwich barracks in south London, Whitehall swung into action. It has promised a new taskforce, chaired by the prime minister, and a root and branch review of Prevent, the government strategy to combat radicalisation.

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