BBC News story.
I completely oppose the idea of giving any prisoners the vote. If you are sent to prison, you should not be able to vote to get out.
I'm not entirely sure that this vote is a good idea though; it could have serious repercussions for the devolved body elections - and the AV referendum.
I don't like the idea of this, but if it was a choice between prisoners voting and pulling out of the European Convention of Human Rights altogether, I'd have to go for the former.