What I think should be asked, is why we are apparently so amazingly rubbish at spying on them. Not only do we keep getting caught doing it, but the people who get caught, even get tracked down and caught again, while they're in England. Someone can literally just stroll over, go to where they live, and poison them with some apparently deadly chemical weapon. I mean did MI5 just email Putin direct with a list of names and addresses or something?
Why isn't being caught spying on another state a condemnable act in itself? The whole point of spying is no one knows you're doing it, because you aren't supposed to be doing it...because if you get caught doing it things like this happen.
It all seems suspiciously staged. Either that or we're alarmingly incompetent.