After World War I, the brothers owned ten vessels shipping coal from the South Wales valleys.
On 19 August 1920, Sir Samuel Instone had a telephone conversation from his home in London to a passenger on a flight destined for Paris.
In 1922, Frank L. Barnard, chief pilot of Instone Air Line won the first King's Cup Race.
Sir Instone took the trophy with him on a visit to Bedwas Colliery, and it was allowed to be displayed in a local shop's window.
[9][10] As an act of public service, Samuel Instone and his brother Theodore once offered to hire Harry Grindell Matthews in order to keep his reported death ray in the United Kingdom.