No, not really, but if they were in federal custody and the UK government (which was a party to the Good Friday Accords) signed off on it, there really isn't too much more to be said.
By the way, my statements regarding Blair and the MoU were just my ham-fisted way of pointing out how silly and hypocritical the OP's drama of Hillary Clinton's statements was. But it is a prisoner transfer, technically. He is supposedly going to be serving out his sentence in Libya. It just seems to be a house arrest than regular prison sentence.
And "life in prison" does indeed mean that you are intended to die in prison.