As the Islamist demagogue Anjem Choudary awaits sentencing for inviting support for Islamic State, the government is facing a crisis of its own making over the radicalisation of Muslim prisoners.

Choudary, who is said to have radicalised thousands of British Muslims over the years, is reportedly to be segregated from other prisoners when he is sent to jail next month.

The review by Ian Acheson of Islamist extremism in prisons, whose summary was published yesterday while the rest remains classified, suggests that a small number of the most dangerous Islamist prisoners be segregated to prevent them from accelerating still further the growing problem of inmate radicalisation.

Neither Choudary’s conviction nor Acheson’s report does more than scratch the surface of this long-standing and dangerous problem. Acheson