The 1901 census, as Joseph
Redding, gives his age as 29 born
Newport Pagnell. In 1881 (available free on
www.familysearch.org)there's a Joseph
Jenkins age 8 born
Newport Pagnell living with his grandparents George, 57, and Elizabeth 51
Jenkins. All of their children were born at Gt
Linford. In 1871 living in
Newport Pagnell was
Harriet Jenkins 17 born Gt
Linford.
If you check the GRO index on
www.freebmd.org.uk there's a birth of Joseph
Redden Jenkins in
Newport Pagnell registration district in Mar 1873. He may have been the illegitimate son of
Harriet, and she gave a broad hint as to who the father might have been. If you purchase his birth certificate you'll get his parents' names, although I suspect the father's name will be blank.
David