Now Choudary —who once called for the Pope to be executed and described the September 11 hijackers as "magnificent martyrs" — could face arrest under anti-terror laws for his evil ranting on the tape, which was passed to the News of the World.

Terrorism expert and author Neil Doyle said: "There is no doubt whatever this a rallying cry to would-be British terrorists.

"And this is the evidence from his own mouth. There's no doubt that the message he's preaching will eventually convince some impressionable people they should start planning 7/7-type atrocities.

"He's certainly becoming the most high-profile cheerleader for al-Qaeda in the UK."

When we spoke to Choudary he refused to discuss our recording but admitted he WAS on a recruitment drive.

He ranted: "I would like to recruit enough to turn the whole country into an Islamic state within a month...by tomorrow.

"You can put that down. I'm trying to recruit 5,000 a week."

It might be too late for Britain to turn back the tide.