Notice how the word “behaviour” is spelled in the British way. Of course, they could be trying to distract us.
I didn’t read much of it, but GCHQ is a British agency: “The Government Communications Headquarters (GCHQ) is a British intelligence agency responsible for providing signals intelligence (SIGINT) and information …..”(http://en.wikipedia.org/wiki/GCHQ).
That is why the spelling is British.
Yes...but the slides have US classification markings.