slim_slag, I remembered reading about BOAC Flt 911 (G-APFE), just re-read it again (Air Disaster Vol.1 Chapter 5, by Macarthur Job).
It states: "The tail fin had fractured at its attachments to the fuselage, the starboard rear attachment fitting having failed at its upper bolt holes in tension....All engine mounting pylons were fractured at their wing mounting points as a result of a predominantly leftward roll (after the separation of the vert. stabiliser)."
All very interesting, I guess we’ll have to wait for the NTSB to complete its investigation to find out the complete chain of events.