What names are you looking for?
From A PM message -
"the couple I am looking for are
JULIA HURLEY and JOHN MARTIN
I would say marriage around 1851 - 1858 and I think Manchester area,
Nothing at GRO but I am sure they would have married"
Do you have them on the 1861 census? Are they the couple lodging with the Taylor family in the St. Peter's district of Manchester? RG 9; Piece: 2928; Folio: 73; Page: 36
This couple are 26 and 22 respectively, and both give their POB as Galway, Ireland. IF this is them then perhaps they married in Ireland and that's why they don't appear in the GRO index or on any of the Manchester/Lancs sites.