I have a man recorded in 1881 in Sheffield with his wife and family, as "patternmaker (unemployed)". He also appears in a lodging house in Erith, Kent as "patternmaker from wks" with several other skilled workmen also "from wks".
He had taken a job at the Woolwich Arsenal, this error usefully shows when he started there and we know the family followed and remained there.
Thank you for this information MollyC and it would have been sufficient to answer my question had I not made a mistake. Because the surname of the lady I was looking for is very common and she was living in a big city it turns out that they were different people!.