Thanks for your message, apologies for me delay in replying to you.
I do have alot of information that I have obtained a recent Diggins get together for the 100th anniversary of the marrige of my Great Grandfather & Grand Mother, Percival George Alexander Diggins & Ethel Habberman.
Most of the information was put together by Margaret Richardson, of Perth, who is the Grand Daughter of Albert Emmanuel Diggins.
I have Johns bith date as 2 Jan 1839 Totnes Devon and the same info as you on his death.
I believe the he had with his wife Christina Sherrod the following children
William Robert 10 Sep 1865 Jessie Maria 28 Jun 1967 Christina Elizabeth 23 Jun 1869 Alice Maud 4 Jun 1871 Laura Evelyn 28 Jun 1873 Albert Emmanuel 18 Nov 1875 Arthur Oswald 21 Nov 1949 Leslie John Rolland 27 Jun 1882 Percival George Alaxander 29 Jun 1882 Arnold Lindsay 14 Nov 1884 Alan Stanley 29 Oct 1887
Perhaps I could fax or post you a copy of the information that I have.
My Email address in Perth is firstname.lastname@example.org my mobile number is 0417 984 016