Hello everyone I had a look back at the 1921 Census report including a John & Mary Cassidy in Greenock, just to make sure everything looked in line with what I said, it says that they live in 6 West Stewart Street, which corresponds I believe to the Death Location of John Cassidy in 1926, so I almost certain it is my John & Mary Cassidy (McIntyre) and as you can see it does have John as being born in "Derry" and Mary being born in Moville, Donegal, but seeing as everyone is in agreement that Mary and family are actually from Co Londonderry, perhaps it is the wrong way round? it also mentioned that John's occupation was sugarhouse Labourer, and his occupation on his death record was sugarhouse worker, so must be him.