This most recent revelation comes from a long, encyclopedic article on the topic by Clarice Feldman at American Thinker. She writes:
The British Government Communications Head Quarters (GCHQ) had been partly funded by the U.S. NSA to the tune of over 100 million British pounds. So they had even more incentive to play ball with Obama. Three days after Trump’s inauguration the head of that outfit unexpectedly resigned for “personal reasons.”It seems likely his "personal reasons" consist of having backed the wrong horse in the presidential race. In spite of what was announced, Robert Hannigan may have been told to resign to spare the U.K. further embarrassment.
This story is the gift that keeps on giving. I won't be surprised if we're still learning new things six months from now.