The way I use Griffiths valuation starts with the map reference So I look up the Griffiths valuation at
http://www.askaboutireland.ie/griffith-valuation/index. under Creevy without anything else, and find immediately two such named townlands concentrating on Creevy in the parish of Aghaderg. use the search engine on Griffiths under ‘details” apage opens of the printed version showing under creevy page 55 it has map references on the LH Column of yhe page
4 a Francis M McCullagh Ho office and land. Land 43 acres, house valued at £2 pa
4 b Samuel Lyons4b sub leased from Francis House and small garden, house valued at 15shillingspa valuation
4 c Anne Grealton also subleased from Francis House and small garden £1 pa
now I go to PRONI and look up
https://www.nidirect.gov.uk/information-and-services/search-archives-online/valuation-revision-booksup comes a table
PLACE NAME URBAN TOWNLAND PARISH COUNTY DATE FROM DATE TO PRONI REFERENCE
Creevy Aghaderg Down 1864 1878 Current PRONI Reference: VAL/12/B/16/14A (1864 - 1878)
Creevy Aghaderg Down 1879 1889 Current PRONI Reference: VAL/12/B/16/14B (1879 - 1889)
Creevy Aghaderg Down 1890 1908 Current PRONI Reference: VAL/12/B/16/14C (1890 - 1908)
Creevy Aghaderg Down 1909 1923 Current PRONI Reference: VAL/12/B/16/14D (1909 - 1923)
Creevy Aghaderg Down 1921 1930
I click on the ref ending with B
I click on Next Creevy is in an index list marked 52
I go to Forward 10 images and click 6 times watching the page number handwritten top RH corner I am now at p 52 which is the end of the previous townland , so I now click Next and find its been cancelled and not referred to another page number and continuing to the end of of Creevy on p57 I go back and find a LH page that is neatly written with Isaac at 4A but no date as to when he took over the blg. so I stop and jump to the book C and find the index page giving P56 I click forward 6 times anfd find myself on p59 ie properties 14 onwards I go back page by page and find renumbering has taken place 4 is the 43 acres of Francis but without any building and now 4a is the building worth £2pa and lived in by Isaac. that’s exciting its a big change in housing
Next I go looking at the OS map itself ie OS 6” Ist series Ist revision printed about 1860 that is all part of the
www.askaboutireland.ie/griffith-valuation I look up Francis McCullagh of Creevy and then look across the headings and find map and two icons , I always use the larger one
Now I open a map However I cheat slightly, I go to Ros Davies website and look up her map of Aghaderg townlands In the southern half of the parish Creevy runs to the border of the next parish Now knowing roughly the shape of the townland and the name of the townlands surrounding it back I go to OS map on askabout Ireland. The art is finding the townland it is labelled but not easy to spot.
I find Creevy townland and realize map ref 4 is bordering the north of the townland I spot b in the LH Corner and c and perhaps an a. Francis farm is sizable but the house valued at £2 is not obvious to me on a modern google map. Along the top rhs corner is a sliding scale that changes the view to modern times Plot 4 is about 200 feet South of an advert for
L Harshaw Cattle breeders 13 Annaghbane Rd Banbridge BT32 3NU on the goggle map a white block is to be seen, switching to Satelite it is a house with drive. I switch again to Street view and go up and down a road but cannot select the right house which should be visible among several possibles.
useing the last of the current PRONI books , I thing fergus is still listed in 1823/28 in Creevy!
So I end with suggesting perhaps you write to L Harshaw with SAE.