...online forum Ummah is being used to prepare a deadly backlash against UK Jews. [Jenvey's] warning came as Europe was hit by anti-Semitic attacks over Israel's push into the Gaza Strip...Mr Jenvey, 43, said: "The Ummah website has been used by extremists. "Those listed should treat it very seriously. Expect a hate campaign and intimidation by 20 or 30 thugs."

Several high-profile British Jews were named as possible targets.

Septicisle noted the backstory on this by visiting the Ummah website, where a poster (a certain "Saladin1970") had suggested that

The names and addresses of Wealthy Zionist Jews can be found in the lists of sponsors and contributors of Zionist Charities...It would be beneficial to start compiling a list so that we can write polite letters reminding them of the injustices of israel and to stop supporting israel.

"Saladin1970" is a genuine Islamist with some unpleasant views, and Jenvey did not write this post. However, the thread "Saladin1970" started did not gather much steam; there are only six contributors spread over two pages, and a couple of posters suggest that such a campaign would be a waste of time and that corrupt rulers in the Islamic world were the real problem.  

One  poster, though, upped the ante by naming three famous British Jews and calling for doorstep protests. This contribution came from a new forum member, "abuislam".

Following the Sun story, an Ummah site manager left the following message:

This is the Thread which triggered the Headline in The Sun News Paper Today

I can confirm that the User "AbuIslam" who is posing as a Muslim on this forum is infact a freelance Journalist by the name of "Richard Tims" who registered on this forum to twist what the original Intent of this thread was for and to make Muslims look bad.

Abuislam Deliberated added comments on this thread which made is as if this thread was intended to cause harm to names that were mentioned

This has been confirmed from his IP address and Email addresses has he used on this forum and previous usernames

Islamic stories wanted by the media world wide why not sell your story for cash.

http://www.sellyourstory.org

Tim now brings to attention the following entry on 1DirBiz:

Title: Sell Your Story - http://www.sellyourstory.org
...Category: Business & Economy: News and Media
Link Owner: glen jenvey
Date Added: July 28, 2008 01:35:11 AM

...that Glen Jenvey and 'abislam' are one and the same person.

In other words, he has created the very 'militant' content that the Sun has based their story on.

Further, in his quote he warns those listed to take the threat very seriously and to "expect a hate campaign and intimidation by 20 or 30 thugs"... when he was the one who listed them, and was the only person talking about doing anything other than writing letters!

Of course, there may be some other explanation, but it is worth noting that Jenvey did in the past run a Jihadist website as an "undercover" activity, which he then replaced with a message mocking Islamic extremism and offering his views on Israel ("There is no such thing as a 'Palestinian'") and Kashmir ("belongs to the Indians").

(Thanks to Tom Griffin for noting the Obsession link)