It seems that the prisons in England that cater for long term, 'difficult' prisoners have a problem with groups of so called radical Muslim prisoners exerting considerable power and influence. Prisoners are persuaded to convert to Islam. It's safer to be part of that big group, plus you get Friday prayers and a different diet. I'm sure there are other reasons to convert and I don't mean to be offensive about the faith, so apologies if my post gives that impression.
Prisons are very difficult places to manage and control. The riot at Strangeways/hmp Manchester was largely initiated by a very small number of famous 'names' including one of Manc's home grown gangsters.
I honestly don't know what the solution to this is. I am relieved that Choudary has finally been convicted. I do believe we're safer with him in HMP but he should have no access to the internet. If he wants to complain that is against his human rights, let him do so.