Just had a quick look at the 1841 census and there is a Francis Buckland (though another member has indicated this maybe Frances), whose maiden name was Langley, living in Burnham, aged 30. This lady is married to a Jeremiah Buckland, and there are 5 children, Charlotte, Charles, Richard, Martha and John.
I know you were more looking for predecessors, but thought this might be helpful.
Cheers,
Toby