Hi
Here is the marriage of Frederick and Rosina, a good idea may be to obtain a copy of the certificate, this would give his fathers name and if he was alive or dead when they married in 1881. This would give something else to research for the 1871 census. It would also hopefully give Fredericks age at marriage.
Name Year Quarter District County Volume Page
HOBBS, Rosina Ragatha 1881 June Edmonton Essex Hertfordshire Middlesex 3a 373
Winder, Frederick 1881 June Edmonton Essex Hertfordshire Middlesex 3a 373
I have looked on the 1871 census and this is the only Frederick born Islington
Winder, Albert 4 Islington, London Son Islington London
Winder, Edwin 8 Islington, London Son Islington London
Winder, Frederick 32 Islington, London Head Islington London
Winder, Frederick 9 Islington, London Son Islington London
Winder, George 5 Islington, London Son Islington London
Winder, Leonard 2 Islington, London Son Islington London
Winder, Rose 31 Islington, London Wife Islington London
Source information: RG12/162
Registration district: Islington
Sub registration district: Islington South West
ED, institution, or vessel: 62a
Folio: 120
Page: 53
This is bit is interesting and indicates that it could be the correct family, Frederick the father is listed as a Journeyman Butcher.
I will send you the image.
Nicky