By Mark White, Home Affairs Correspondent
The beheading by Islamic State of British aid worker Alan Henning may have led to thousands of lives being saved because it has deterred young Muslims from joining the jihad, a member of the government's top anti-radicalisation programme has claimed.
So brutal and callous was the murder of the Salford taxi driver that it has "turned the tide" of British people looking to join the fight in Syria and Iraq, Sky News has been told.
In an exclusive interview, Sulaimaan Samuel, who works as a National Safeguarding Mentor for Channel, a Home Office scheme to tackle people judged to be at risk of radicalisation, told Sky News that IS propaganda tactics had "backfired".
It is the first time anyone who works as part of the project has given a detailed insight into IS tactics and the threat the group poses online.
Mr Henning was murdered by IS in October
Mr Samuel said the "grotesque" beheading of US journalists James Foley and Steven Sotloff in August and September led the Muslim community to start to seriously question IS.
British aid worker David Haines was also beheaded later that month. But it was the murder of Mr Henning in October that was the "turning point", Mr Samuel said.
Video: IS Propaganda 'Backfiring'
"I would personally say to Alan Henning's family: do not think his death has been some type of waste because it hasn't, because his death at the hands of IS is the very thing that has caused the Muslim community to realise that what IS stands for is wrong and can never be condoned.
"In Alan's death he has managed to save thousands of lives now and in the future of people who might potentially have been drawn into going out. He will be saving lives in the future.
"What IS has done has backfired."
Security Minister James Brokenshire said he believed the relative effectiveness of the terror group's own brutal propaganda machine had opened people's eyes to the true nature of IS.
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Gallery: Profile: Alan Henning
Alan Henning, 47, was born in Salford, Greater Manchester. Friends gave him the nickname "gadget" due to his love of technology
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He was married for 23 years and he had a teenage son and daughter
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He worked as a self-employed taxi driver
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Mr Henning saw the plight of Syrian people and volunteered with a Muslim charity. He had been to the region at least three times
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He drove life-saving medical equipment from the UK to Syria in old ambulances. He left in December 2013 to make the 4,000-mile trip
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He was kidnapped by IS in Syria by masked men. He may have been held in Ad Dana near Aleppo, then Raqqa
He said: "I think some of the shocking videos that we have seen, of brutalising murder, has underlined simply what IS is about and why it has prompted British Muslims to go online, post their own videos to underline their absolute abhorrence to this appalling violence and brutality."
A senior Government security source has also highlighted a "discernible change in attitude" from mainstream Muslim society.
The source said: "What IS has done is demonstrate very clearly to everyone that this is no longer an unambiguous struggle to topple Assad, involving freedom fighters and people whose motive is simply to help Syrian people, and that terrorist groups have made the environment much more complicated and in turn have made it less clear cut for people as to whether they should travel or not."
Mr Samuel - who counsels those thought to be at risk of radicalisation - said the majority of his work is now dealing with young people being attracted to travelling to Syria and Iraq via the internet.
Video: Social Media Aiding Terrorists
He said: "The days where the baddie, the super villain was in a cave, in a dark lair somewhere sat in a corner, stroking a cat - those days are finished.
"With the advent of technology, the internet, people can promote any idea they have. You don't need to be Michael Moore or a Spike Lee to reach a wide audience.
"Initially it may be a curiosity to see something shocking, but very quickly you can find yourself with a string of related videos which might lead you down a path which half an hour ago wasn't your destination."
Since Channel was set up in 2006, concerns have been raised about a total of 3,934 people - including 1,450 children.
Video: Sept 15: Special Report UK Jihadis
Of these, 777 people have been formally assessed as being vulnerable to radicalisation and referred to the project for formal help.
