Still meant to be doing other things, but I couldn't resist checking for one of the FAIRBAIRN families in the 1911, that of Archibald Henderson & Fanny Waite (FAIRBAIRN) FAIRBAIRN. The index showed them living in Gateshead but with slightly different names to those expected, so I shelled out for the image.
Nellie has turned into Helen Douglas, born Ednam; John into John Douglas; Isabella from earlier census records has become Elizabeth (which does match her birth registration).
The address of 73 Crossley Terrace allowed me to connect up the Edward FAIRBAIRN I'd found travelling to and fro between England and Canada between 1931 and 1936 (and possibly earlier) as Archibald and Fanny's son.
This FAIRBAIRN family is an amalgam of that of James and Mabel/Mary Bell (THOMSON) FAIRBAIRN of Eckford, and that of the Ednam blacksmiths. Still working on getting a dna representative for this line.