David Cameron's major policy speech on the challenges posed by Islamist extremism has been hailed in some quarters as a nuanced intervention in a complex and sensitive area, as well as attracting criticism from some others, including parts of the British Muslim community.

The prime minister's speech is interesting in a number of ways, including the light it inadvertently sheds on the ongoing political challenge posed by the growth in extremism in the last decade or more.

His speech contained some echoes of one made almost 10 years to the day by one of his predecessors.

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