An associate of Anjem Choudary's, Abdul Hakeem, has said that imprisoning Choudary will not prevent his message from being distributed, and may in fact strengthen the hate preacher in the eyes of his followers.
Speaking to ITV News' Security Editor Rohit Kachroo, he said: "The only issue is, who's going to fill his shoes?"
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Full text of the unsigned letter.
A second note states the PM thinks a delay would be corrosive in a move likely to spark a political row.