How about the Brits give him a suicide belt but without the 'trigger'...
Let him walk around just wondering when his time is going to be UP!
It's insane to free such a terrorist leader.
This may be an area where western governments and organized crime can cooperate. If the UK or US governments can't "dispose" of a terrorist madman like this goofball, then have the Mafia take care of him.
Why stop there...
Give him a nice flat in the center of London and subsidize all his utilities, meals and petrol.
Heck, provided him with a personal videographer, free studio time and distribution channels requiring all stores that sell DVDs in the country to carry his message.
That would be nice.