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Preachers of separatism at work inside Britain's mosques
In a large balcony above the beautiful main hall at Regent's Park Mosque in London - widely considered the most important mosque in Britain - I am filming undercover as the woman preacher gives her talk.
What should be done to a Muslim who converts to another faith? "We kill him," she says, "kill him, kill, kill…You have to kill him, you understand?"
Adulterers, she says, are to be stoned to death - and as for homosexuals, and women who "make themselves like a man, a woman like a man ... the punishment is kill, kill them, throw them from the highest place".
These punishments, the preacher says, are to be implemented in a future Islamic state. "This is not to tell you to start killing people," she continues. "There must be a Muslim leader, when the Muslim army becomes stronger, when Islam has grown enough."
My investigation for Channel 4's Dispatches came after last year's Undercover Mosque, which investigated claims that teachings of intolerance and fundamentalism were spreading through Britain's mosques from the Saudi Arabian religious establishment - which is closely linked to the Saudi Arabian government.
Friendship with non-Muslims is discouraged because "loyalty is only to the Muslim, not to the kaffir [disbeliever]".
A woman who was friendly with a non-Muslim woman was heavily criticised: "It's part of Islam, of the correct belief, that you love those who love Allah and that you hate those who hate Allah."
One preacher even says Muslims shouldn't live in Britain at all: "It is not befitting for Muslims that he should reside in the land of evil, the land of the kuffaar, the land of the disbelievers."
Another, Um Saleem, says Muslims should not take British citizenship as their loyalty is to Allah.
watched as an interfaith group was brought in to meet the mosque's women's circle for a civilised exchange. But when the interfaith group wasn't there, the preacher attacked other faiths, and the very concept of interfaith dialogue.
One preacher said of Christians praying in a church: "What are these people doing in there, these things are so vile, what they say with their tongues is so vile and disgusting, it's an abomination."
Um Saleem was also at some of these sessions. Here, the women were given strict restrictions on their lives: it is reiterated that British Muslim women cannot travel far without a male guardian, cannot mix with men, and have to remain fully covered up at all times.
One woman in the audience queried the strict rulings that she cannot travel without a mahram - a male member of the family - escorting her. She asked: "Sister, if me and my husband, we can't go together, what do I do if I want to go?"
She was told she cannot travel by herself.
She asked again: "So what do I do?"
"You go with your husband," Um Saleem replied.
There were also restrictions on education or work opportunities. One woman, who works for the NHS, was told she should leave her job as it meant mixing with men and not wearing a full Islamic garment.
"You know that working in an environment that is not Islamic, working with the kuffaar, all this takes you away from the religion and hardens your heart and it would be lying to you if I say it's OK," Um Saleem explained.
Um Saleem also criticised Muslim women who integrate into society - a view that is counter to the aims of the Regent's Park Mosque.
"You see Muslims in every sphere of everyday life in this country, I see Muslims, it breaks my heart when I see them working in banks, short sleeves, tight scarf like this, make-up, being with the kuffaar all the time, even speaking their language," she said.
The director general of Regent's Park Mosque is Dr Ahmed Al Dubayan, a Saudi diplomat. He has denied to Dispatches that his mosque promotes the Saudi version of the faith, often called Wahhabism. And indeed, the imams in the main hall are Egyptian, and the sermons I heard from them were tolerant and moderate when you listen to them on Fridays.
But the preachers I heard in the women's section took their theology directly from Saudi Arabia.
I don’t have time to precis further; I am off to church to meet the Lord in bread and wine and to say a few vile and abominable things, “meekly on my knees”. Read it all here.