The marriage record is on the Cheshire Parish Records Project database
http://www.csc.liv.ac.uk/~cprdb/ here it is
8661101
SAMUEL SHORE bachelor policeman of West Kirby (father George Shore, blacksmith)
married Eliza Roberts spinster of Grange by banns (father's name Edward Roberts, Licensed Victualler)
both signed. Witnesses were Solomon Hill and Mary Matthews
There are a couple William & Mary Roberts living in Neston (close to West Kirby). In 1881 Mary is a widow & a publican - so was William a publican in an earlier census? If so and I can establish a family link to Edward Roberts we might imagine that Edward of Maria moved to Neston to help in the pub. What do you think?
Best Wishes
David