Glen Jenvey is the subject of a 2005 book by Neil Doyle called Terror Tracker. In Doyle's book Jenvey comes across as something of an expert in sniffing out terrorists online. And it was with this understanding of him that I met him in 2006 and asked him to become involved in a project I had set up to help pass intelligence on Islamist extremists to the British and other authorities.

I had no reason to doubt Jenvey back then. He had a criminal record - but so did many talented people. At first I was wary that he sought the limelight. Yet when he set to work recording Omar Bakri and sent me some astonishing results I knew I'd chosen well. The year that followed was a great success.

I fell out with Jenvey in March 2007. He, Starkey and an Islamic crone called Ilham Frandsen wanted more cash than they were worth from the project we were involved in - more cash than the project could afford. I've never worked with any of them after March that year. Since then all three of them have gone about trying to wreck me in their own particular ways. Happily they have all failed and continue to fail, especially now they know that the police are aware of their motives and are keeping a beady eye on them.  

Sadly the Glen Jenvey of today is unrecognisable from the Glen Jenvey of Terror Tracker fame. He has been caught faking a newspaper story for cash (the Sun's Jewish Hitlist piece of January 2009), has been publicly ripped to shreds as a Walter Mitty fantasist by the journalist Tom Mangold on BBC Radio Five Live's Donal MacIntyre Investigates, and now people are asking whether, as it seems highly likely, Jenvey was behind further fake stories too, such as the one in the Mirror this year suggesting Madonna was a target of extremist Islamists.

Jenvey's self-destruction has been spectacular. It's been a sorry fall from grace for someone who at one point, almost single-handedly, had extreme Islamists in Britain scarpering for an exit.

Apart from this public humiliation, Jenvey has now "converted" to Al Muhajiroun and spends his evenings on Muslim forums calling himself Omar Hamza Jenvey, filling his posts with references to "nasty Zionists" and talking of the British police as if they've got it in for him and all Muslims.

If you make the time to follow Jenvey's posts you see that nowadays they most often contradict each other and occasionally refer to the former "Glen" Jenvey in the third person (as if he is a different fellow altogether from Omar). You can be guaranteed these posts spill over with daily bile and hatred for various people including me.

I occasionally retort to Jenvey's attacks but normally just MHT them and add them to a case I have been building against Jenvey for months now. (Any man under such assault will inevitably defend himself against lies and fantasies designed to be damaging).

I try my very best not to bother replying online to Jenvey's post-whisky rage which starts at about 9pm - after which the worst emails appear and his posts start appearing in confused, blabbering, personal tirades which are always "mitigated" by the fact that Palestinians are daily suffering (no, Jenvey is not a Palestinian and no, he's never been to Palestine).

I get on with my life and if by ten o'clock Jenvey's not dropped another vicious post, I start to think that I've maybe got away with it for the night. Maybe he's watching Lawrence of Arabia again or at an Al Muhajiroun beard-sculpture evening. Maybe there's been a power-cut down his way or it's bingo night at the drop-in centre. But that's all just wishful thinking.

Like the penniless man kneeling before his letterbox waiting to stop the postman pushing brown-bill mail through it, there's that inevitability - Jenvey's attack will come. In the back of your mind you know it's coming. And sure enough it arrives. Jenvey's rant - sometimes several in one evening - molesting your inbox as Google Alerts start flying in, warning you of Jenvey's most recent insults against your name.

I have known for some weeks now that Jenvey is unwell. Let's be honest here - Jenvey is officially sick. He suffers from a recognised mental illness. A condition I have been told can be treated with medication and support. His past behaviour - punching a civilian (who turned out to be a policeman) in a road rage incident, doing some time inside for embezzling and faking it as a spy (in one rant saying spies like him live "tax free" in the UK) - are not his fault. He's unwell.

I guessed there was something afoot when in May Jenvey pretended to be a chap called Arthur and telephoned an office where I did some work and threatened their whole enterprise with "danger" for being associated with me. (My friend who picked up this odd call had heard Jenvey's voice before and simply said "You're not Arthur, you're that bloke called Jenvey" and Jenvey grumped and groaned a bit and then simply hung up.) Since then there have been weird emails and dropped calls (though the latter could be down to other stalkers I've collected over the years). 

So let me ask you a politically incorrect question. Is being mentally ill an excuse for bombarding people online with abuse and fabrication? Does being mentally ill let you off the hook when you alone (yes, Jenvey admitted this in an admirable public apology) smeared someone as a paedophile in various places online? Does being mentally ill morally justify you going online every single day and night when the oxygen your mental illness loves most is the Internet itself?

I mean no slight to anyone with a mental illness. A colleague of mine is a paranoid schizophrenic and, as well as being a genius, he's a tremendous bloke I trust wholly.

As for Jenvey - I have enquired. (This man has affected my life in a negative way for the last three years. One is bound to make enquiries). And guess what? There is no legislation available to the authorities in Britain today to prevent people who have an Internet-related mental illness like Jenvey from reaching for their mouse and keyboard. Nothing to stop internet providers offering their services to people like Jenvey who are afflicted by a problem which not only affects him but whoever happens to be the victim of his psychotic Internet attacks that day.

There's not a fake name he's failed to use. This man sock-puppets for England (and Palestine). Abu Islam, Richard Tims, George Chetty, Pervez Khan - the list is endless. An Internet search on my name and loads of Jenvey's sock-puppets emerge having a pop at me - disguised as Islamists, Communists and myriad other characters from across the political spectrum. Rarely a day goes past without some form of attack. The police say appoint lawyers and try your best to sit on your hands - well, I'm trying! But this man has got to be stopped from using his computer once and for all - at least until he gets better - for his sake and mine.

The victims of these fake individuals' attacks - all managed by Jenvey - are not only Jenvey's targets. Jenvey's the biggest victim of the lot as he's the one who has to explain himself to the authorities and make embarrassing public apologies. Innocents whose lives have been affected by Jenvey's recent penchant for fakery are none too happy either - not just the Lord Sugars and Amy Winehouses who, as public figures, have a right to reply loudly. What about those others who get caught up with his antisocial behaviour? What about the owners of the forums he uses for his fakery? What about the newspapers and politicians he has duped?