Dave,
So then Keith. Do you now accept that there may be other reasons for the over-representation?

I always did. As I said at the time, I believed that one " only because of the testimony of all those knowledgeable people, and always acknowledging that only a tiny minority succumb."

As you said, "I did, incidentaly, put up what I felt were reasonable reasons for such an over-representation earlier but only Keith chose to respond. And then to only agree that he, like myself, did not have an answer! "