As your posting 1s 3 years old, you may already have the information below.
James Dunkley was in fact born in Staverton, Northamptonshire. His death certificate incorrectly shows Stafford Town which sounds almost the same as Staverton.
The website named Wendy's Family Tree tells you a lot about your family. If you email Wendy, she can tell you more.
Don Dunckley, New South Wales