Rigby is very much a Merseyside name as you can tell from the surname distribution map. The Beatles sang about Eleanor Rigby.
For genealogists with a Merseyside link Martin Rigby's Genealogy Blog is worth a visit. The first postings were in February and started with beginner information. The archive of the site also includes several postings in a "My ancestor was a ...." series for various occupations, including policeman, mill worker, railway worker, seaman and servant.
Martin Rigby writes for the Liverpool Echo where you can find some of his material on their web site.