I thought this was going to be solved using the collective intelligence of Hacker News and Reddit but it seems that with only 2 days to go, there has not been a successful completion of all stages.<p>GCHQ director Robert Hannigan, who set the string of teasers, offered a clue: "It's not as abstract as you think."<p><a href="http://www.bbc.co.uk/news/uk-35429971" rel="nofollow">http://www.bbc.co.uk/news/uk-35429971</a>