Hello Obbie
Thank you for your message .
I have around 28 documents I bought from the Sligo.brsgenealogy site , I started in Sligo then went towards Mayo as I wasn't sure if maybe the borders moved over the years as Durkins seem to be from the mayo area then tried Roscommon , I failed to find any of the 4 children born in Sligo even allowing 5 years either side .
I also paid for a location search of Sligo which turned up negative , I am quite sure that Mary may not be the mother as all my Fury men seem to always be widowed to losing the first wife even up to present day , but I have not found any of the children with John as the father & a matching mother .
The only time Sligo was mentioned was the 1851 census quoted & 1881 census for Thomas Fury living in Nottinghamshire the rest of the census just say Ireland & as you pointed out John was from Bollington not Sligo although Mary was from Sligo allegedly , I gave up on the marriage .
The only fact I do know is they were Roman Catholic & on Catherine Fury's birth certificate it states mothers maiden name Durkin/Durcan 1847 caistor Lincs and on Mary's death certificate in 1866 she used Durkin as her middle name , It's been like pulling teeth trying to trace my mothers family , even my mother's father Clifford Fury who married for the second time in 1936 the marriage is transcribed as Clifford Terry , I thought the name would be easy !!!
Regards Elaine