[Margaret Pilkington]

I know that it has been said that internment of such murderers would not work...and to some degree I think that is true,but it could be a solution of sorts.
Especially if these terrorists were housed on some remote, bleak and cold Scottish island.
Somewhere that is a damn good swim away from the mainland(say 10 miles), somewhere with no phone or Internet signal and only heather to fall out with.
Drop them off with just enough supplies to make a bivouac and then drop beans and rice on a monthly basis.
It would be a cheapest option as no one would be needed to supervise their lives.
So what is wrong with this...well, of course it does not meet with the criteria of the EHCR.