I just came across your posted message looking for information on Robert Ashby Gunning...I hope the little information I have will help.
Robert Ashby Gunning was my great-great grandfather, I do not have infomation on place of birth but I do know that his wife's name was Elizabeth Gunning (nee Harding). They had two children that I know of, a son,Robert Harding Gunning (my great grandfather), and a daughter Lucy, and it appears by your information that they also had another daughter, Alice Sophia.
My grandfather was John George Gunning the son of Robert Harding Gunning, I do not know if there were any other siblings.
I have obtained quite a lot of information on John George Gunning..John George's wife was Elizabeth Jane, this was her second marriage and they settled in Swansea, South Wales. Elizabeth's first marriage was to Matthew Lawrie with whom she had four children. Her second marriage (to John George) they also had four children, one of which was my mother Lillian Doris.
It appears that we have a connection. I would be pleased to have any other information you wish to share.I have been working on my family tree for about five years, it is a slow process,I have obtained photographs of Robert Harding Gunning and also my grandfather John George that I would be willing to send you.Research on my mothers side of the family has not been very succesfull compared to my fathers side, of which I have been able to go back much further. If I can be of any further assistance to you please let me know.