Thanks Debbie you may have found a breakthrough, William Merritt Gillam's father is shown as a Master Mariner on his Wedding Certificate therefore I shall attempt to follow this through.
I have some old letters and notes given to me by my Mother which centres on Countesthorpe where I believe the family were, or maybe still, landowners since the 1600's, they also provide some names from early 1800's but so far no link. It is my intention to visit Countesthorpe in the late summer to do some research if time allows.
Again many thanks I'll let you know how I get on.
Pete44