Hi Caroline,
I found your posting today and noticed references to the Fyfe and Hewitt families. George Fyfe was my great granduncle. His daughter, Louisa, married Simon Henry Hewitt who was the son of John Hewitt and Mary Ann Johnson. As you said, George Fyfe was the son of John Fyfe, agriculturalist on the Arvagh estate of Lord Gosford.
I have the book, "Arva(gh) - Sources for a Local History" by Francis J. McCaughey (about 1998). There are very few references to Whyte/White and Hewitt families. One may be relevant to you.
Coroneary National School was one of the earliest in County Cavan. It was taken into connection by the National Board in 1834. The original applicants for Grant in Aid were:
Protestant
Joseph Denham,
Presbyterian Minister
James Armstrong
Richard Whyte
Samuel Thorriton
Thomas Johnston
Thomas Green
James Graham
Let me know if I can help you.
Regards
Dennis Fyfe
Sorrento, Western Australia