Since I posted the first note, I have been thinking about the International Twist Drill branch office in about 1958, and I may have got a Christian name wrong, for it was Colin Williams who was in charge, not Mike.
To respond to the previous message, I don't think I want to search the births, deaths and marriages at present, I was just hoping that someone might, for instance, know something about Benson & Bond or/or International Twist Drill, and the names I have mentioned might 'click'.
It may well be that Jill Dibble went abroad, for she was the sort of person who might well have gone on to do that.
Anyway, thanks.