I know nothing of the book mentioned by "Peter Laban."
I very much doubt it is him.

The British government foolishly tried to explain BS away.
From the famous and brave priest and many other reputable witnesses that spurious claim never stood up and was soon withdrawn.

What had the riots to do with the summer parades Jim, and what makes them "sectarian"?

My opinions WERE just those of Sinn Fein. I quoted officials' statements.