Tony, do you know what year Joseph died? - If recent enough it might give his exact birth date in the index.
Could this be Thomas's marriage? [From Findmypast.]
Name:CORKHILL, Thomas
Registration district: Whitehaven
County:Cumberland
Year of registration:1876
Quarter of registration:Jan-Feb-Mar
Spouse's last name: Not available before 1912
Volume no:10B
Page no: 866
MarriageFinder™: Thomas Corkhill married one of the following people:
CRENNEL, Elizabeth
DAILEY, Margaret
Are either of those names correct for Thomas's wife?
Sue