Do you believe SH confession to be genuine or do you believe him to be innocent?
I believe his confession, as he doesn't seem to have anything to gain after all this time, and so much to lose, friends family supporters. I don't see what duress could have been applied, he was due to have his category changed I believe in preperation for a move to a lower category prison. That will probably still happen, ha will have been asked many many times to attend courses to "address his offending behaviour". He would have refused whilst maintains his innocence but will now probably attend. I know in our case both boys refused point blank to sign up for these courses and non-attendance played no part in re-categorising either of them, in fact K was indeed released without attend any of these courses.
I can't see any other reason for his confession other than it being true. I am willing to change my mind if other facts come to light.