When the 'Hong Kong Baffled by Snowden's Hideout' WSJ article was posted (https://news.ycombinator.com/item?id=5853397), one paragraph that leaped out at me and also got some attention in the comments was the following:

"Hong Kong is the worst place in the world for any person to avoid extradition, with the possible exception of the United Kingdom," said one lawyer who’s worked on a dozen extradition cases both in the U.K. and Hong Kong"

I don't know what to make of that or how to put it together with this Home Office alert, but it is all rather interesting.