James is slightly shadowy.  There is a James Loudon to be found with Jane G Loudon in the electoral rolls.  Jane Gavina Loudon was both executrix and beneficiary in the will will of her grandmother, Marjorie Frances Cameron; this will included a gift to James Rushworth Hope Loudon.  I think they are a couple and that James, with these initials, is the person whose birth index is:

First name(s)           JAMES R H
Last name               LOUDON
Birth year              1943
Birth quarter           1
Mother's maiden name    Jellicoe
District                Newbury
County                  Berkshire
Country                 England
Volume                  2C
Page                    524
Record set              England & Wales Births 1837-2006
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