Years later and my best wished go out to all!
I am taking a few moments to review old information, since I haven't been able to pursue my searches in years.
My g grandfather was James Ferguson born at Strandtown, Holywood in 1861 (Scottish census in ref). His parents were Samuel and Agnes Boyd (who was from Anahilt - English census ref).
I have from Mary
SAMUEL FERGUSON TO AGNES BOYD 28-2-1858 @ MAGHERADROOL COFI,MAGHERADROOL,DOWNPATRICK, DOWN.
Which seems to be a likely match. (apparently Samuel Ferguson's was 24 at marriage, b 1834 father Alexander Ferguson Agnes Boyd was 19 b 1839 father James Boyd - Magheradroll M70218-4 film 101 395 p 648 in36 Magheradrool 20:38/51)
I had originally found a marriage (IGI) for a Samuel Ferguson and Agnes Boyd in 1863:
Samuel Ferguson Birth: 1838 Of, Holywood, Down,
Agnes Boyd Birth: 1842 Of, Holywood, Down, Ireland
Marriage: About 1863 Of, Holywood, Down, Ireland but it no longer appears in searches so maybe it was erroneous.
Their children appear to be born at Holywood (Agnes-who must have died before 1870,Anne b. 1870 for whom there are IGI records, also James b. 1861 and John b. 1863 for whom I have found no online records.) They left Ireland after 1870 and before 1880 (when they were in Workington Cumberland Eng,) but may have gone to Scotland first.
Family notes: Samuel may have had a brother Hank (John?) who became an Anglican minister and inherited family property. I think Samuel quit the Anglican to go to the Presbyterian church. (some story about bitterness re: a burial) The surname Black features somewhere.
Who knows if there are more records that could shed some light!
All the best to one and all