I see they went to Lancs. 1861 census index from Ancestry:

Name: William Corkill
Age: 45
Estimated birth year: abt 1816
Relation: Head
Spouse's name: Jane Corkill
Gender: Male
Where born: Isle of Man, Isle of Man

Civil Parish: Bootle Cum Linacre
County/Island: Lancashire
Country: England
Registration district: West Derby
Sub-registration district: Walton
Household schedule number: 262 263
Household Members: Name Age
William Corkill 45
Jane Corkill 43
John Corkill 22
Robert Corkill 15
Ann Jane Corkill 12

Did any of the later records help? Any relatives mentioned anywhere? Bible? Will, etc?

Sue