Hiya Jack,
I wonder if this is your William Niblock, born in Belfast in 1845.
1880 Directory of Belfast and the Province of Ulster
Niblock, Wm., ship carpenter, 12 Shipbuoy Street
Do you know if he remained in Belfast or did he leave Belfast.
He appeared in the 1880 Directory of Belfast and the Province of Ulster.
I thought you might like McCauleys from the 1852 Directory too.
B., boot and shoe shop, 90 and 94, North Street
Hugh, shoemaker, 9, Robert Street
John, smith, 7, Gavin's Buildings, Shankhill
James, brickmoulder, 128, Old Lodge Road
All the Best, Chris