Andy, judging by the BBC this morning (yes, BBC health warning and all that, but still…), the backstory is apparently (and I stress that “apparently”) that the US government wants (and has wanted) these five individuals out of Guantanamo for some time, but that the Brits had, understandably enough, not wanted them: as you say, they are not British citizens. The fact that Britain is now agreeing to take them was described as something of a favor to the US. As to what happens to these individuals once they arrive in the UK that would, the BBC reporter said, be a problem. You are, of course, quite right to highlight earlier difficulties (I’ll use a neutral word) in this respect.