The William Cocker who was buried in 1835 appears to have left a will
Testator's name: WILLIAM COCKER
Occupation/status: FARMER
Minor place: Not given
Township: COTTAM
Parish: PRESTON
County/Country: LANCASHIRE
Other information: None
W/RW/A/R159b/2
http://archivecat.lancashire.gov.uk/...159b%2f2&pos=8
Not sure it the link will work.