I don't see anything about "with fury" in the wikipedia article you mentioned, but it does say he was with the agency for 30 years.

Not that we'll ever know what really happens over there (nor do I claim to know anything about these things), but in interviews, his argument was that his project was more sensitive to the privacy of American citizens, but the agency instead instead went with an approach that violated the constitution. Leading him to resign.

And aren't there other sources from the British government that essentially agree that the UK "review" doesn't exist?