Gillian,
Although Seaton Sluice was/is only about a mile and a half from the village of Seaton Delaval, us Northumbrians ( at least the south-easteners) weren't as good walkers as you Cumbrians. The men liked to live on top of their work. And Robert Smith, a bottle maker, lived in Seaton Sluice, almost "within" the Lord/Lady Delaval's glassworks, and probably within a glassworks cottage ! There were no glassworks in Seaton Delaval
Cgp. The 1881 census page( ref 5089-38-13) which included your Smiths, had been nicely completed by J J O'Donovan across the top to show that the family were ...
In the Village of Seaton Sluice, within the "township" of Hartley, within the Parish of Earsdon.
Michael