Hi, I'm not sure where I fall into this picture but my last name is McAdam and my family is also from Guyana. My grandfather's name was Charlie McAdam and his father's name was William McAdam who married Amina Khan.
It seems as if either the children of Michael and Catherine McAdam did not return to the UK or had families before they left. Or, perhaps my branch of McAdam stems from one of the children who did remain.
I know there is someone from the UK who is also looking to see what happened with this family.
Maybe we can all collaborate on information. Please feel free to email me at email@example.com