For years, Abu Qatada has been in and out of prison in England. For years, successive governments have been trying to get rid of him. The question that is rarely asked, and never answered, is why has he not been tried in an English court? He is, after all, described by ministers ? Theresa May, the home secretary, was at it again on Monday ? as a serious threat to our national security. "A dangerous man, a suspected terrorist," she called him.

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