Esther Buckingham who married John Miller has nothing to do with your Hobbs line, Viv. Esther died in 1846 and John Miller married her younger sister Sarah (the wife in the 1861 census).
I don't know who the Esther Buckingham was that married Thomas Hobbs but she's not the same one who married John Miller.
I'm descended from Esther's brother James Buckingham (who lived with the Millers in 1841). Sorry I didn't see your posts earlier or I could have jumped in then to save you pursuing a red herring!