Women preachers are urging followers at one of Britain’s most influential mosques to kill homosexuals and view all non-Muslims as “vile”, according to a television documentary.

The London Central Mosque and Islamic Cultural Centre, known as the Regent’s Park Mosque, is one of the most respected centres for moderate Islam in western Europe.

However, an undercover investigation by the Channel 4 Dispatches programme has found extremist preachers have held study circles there and are teaching followers a hardline version of the faith followed in Saudi Arabia, known as Wahhabism.

The documentary, to be broadcast tomorrow, is a follow-up to Undercover Mosque, which investigated a number of mosques and was made by the same team more than a year ago. That resulted in an investigation by West Midlands Police, who accused the makers of distorting sermons and inflaming tensions. Officers took no action against extremist preachers whose words were broadcast. Ofcom rejected the complaint and the force had to apologise to Channel 4. It agreed at the High Court to pay £100,000 for libel.

In the new documentary, a female reporter infiltrated women’s study circles. In one, a preacher using the name Umm Amira told followers: “We are not going to be like animals . . . or to be like the homosexuals, God save us from that, you understand? We have to take the judgment, the judgment is to kill them.”

Umm Amira is recorded as saying converts from Islam should also be killed. “He is Muslim and he gets out of Islam, he doesn’t want any more. What are we going to do? We kill him, kill, kill.”

In another study circle, Umm Amira describes Christians as “vile”. Another preacher, Umm Saleem, tells her congregation not to take British citizenship or become friends with nonMuslims.

In the programme, Ahmed Al-Dubayan, the mosque’s director, said the women were not authorised by the mosque.

The preachers could not be reached this weekend, but Umm Saleem told Channel 4: “We are not blind followers of any government or any clerics.

We criticise other religions, just as other religions criticise Islam . . . we encourage integration into society.”

The Muslim Council of Britain, of which the mosque is an affiliate, said: “Some of the statements are deeply offensive . . . [but] it would be very wrong, and quite unfair, to smear the whole centre.”