Hi Laura
I couldn't find Kate Attwood or Cogans on Luton 1891 census I'm afraid, but I was only using Free-cen UK someone else may have better access. Here she is from the LDS site in 1881 and her possible partner, I couldn't find a John Cogans in Bedfordshire in 1881. You could order her marriage certificate for more info, then take it from there. Happy searching

Jan
Household:
Name Relation Marital Status Gender Age Birthplace Occupation Disability
Nathaniel WALLER Head M Male 45 Luton, Bedford, England Straw Hat Manufacturer
Adelaide WALLER Wife M Female 47 Rothwell, Northampton, England Straw Hat Finisher
Kate Adelaide WALLER Daur U Female 15 Luton, Bedford, England Scholar
55 Albert Road
Luton, Bedford
RG11/1651 Folio 71
Page 6
Name Relation Marital Status Gender Age Birthplace Occupation Disability
Thos.Gardner ATTWOOD Head M Male 32 Stow, Gloucester, England Straw Hat Manufacturer
Margaret ATTWOOD Wife M Female 32 Clipstone, Northampton, England Straw Hat Assists
Thomas Josh. ATTWOOD Son U Male 16 Luton, Bedford, England (St) Warehouse Assistant
William Robt. ATTWOOD Son Male 13 Luton, Bedford, England Scholar
Arthur Saml. ATTWOOD Son Male 9 Luton, Bedford, England Scholar
Elizth.Kate Mary ATTWOOD Daur Female 6 Luton, Bedford, England Scholar
Emma SWAN Serv U Female 18 Mangrove Offley, Hertford, England General Servant
42 Stuart Street
Luton, Bedford
RG11/1652 Folio 115
Page 19