Last week, a deputy head teacher in Birmingham, called Razwan Faraz, tweeted a newspaper article casting doubt on claims that hard-line Muslims were plotting to take over some of the city's state schools. "The truth reveals itself," he said.

The document behind the claim, supposedly a "how-to" letter from one Muslim extremist to another, certainly had its problems. At least one of its claims was wrong, taking credit for the ousting of a head teacher that had occurred 20 years before. The very name the letter gave to the alleged operation, "Trojan Horse", was perhaps a little too obvious. For that reason, this newspaper and others described it as a "purported" document.

But whether or not the letter is genuine, much of what it describes is certainly real.

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