Just to add another personal note on the Addis crash. I also lived in Kenya at the time and remember it as a 12 year old due to fly out from Nairobi soon afterwards. It was one of the flights used by parents to fly their children back to UK for school, known to many of us as 'Lollipop' flights. Many of my contemporaries where on that flight. I recall accounts of some very brave individuals amongst the survivors who did great things to save some of the children.
I do not recall the source of the information but I remember reading that a loading hook had fallen off the previously departing flight. The VC10 hit it and suffered tyre loss (I thought it was the starboard undercarriage), followed by failure of the starboard engines due to debris ingestion. It may have been a report that was published in the Daily Nation or The (East African) Standard.