Is your JOHN GEORGE VANE the one that was born Aug. 24, 1911 in Elkham, Kent, England and died April 1991 in Hastings, East Sussex, England. (This information was found on Ancestry.com ' "England & Wales Death Registrations")
If so. there is a LAVINGTON FAMILY TREE (owned by Jill Holmes) on Ancestry that has information on him. This person states that his parents are ROBERT WILLIAM VANE (born 1881 in Beddenden, Kent, England) and AGNES HELENA PATTERSON (born 1888 in Abassiyeh, Cairo, Egypt and died 1959 in Hastings, Sussex, England.
Hope this helps you in your search! Sincerely, Melinda