Hi Janis
I've assumed (I know, never assume!) that Barbara Bailey is the correct one, as 2 of the children were given Bailey as middle name.
I have, however, struggled to find the link to their marriage - do you have access to it?
John and Barbara are the furthest I've been able to get back, I keep being distracted by other lines of research, really must get back to those Turnbulls...
Julie