[NZtyphoon]

"These are, or will be operational Stations although they have no Hurricanes or Spitfires at the moment. In the near future these stations will have Merlin engine aircraft that will require 100 octane fuel." 9 December 1939

Not might require, not maybe require but will require 100 octane fuel. Clear recognition that as early as December 1939 Merlin engine aircraft such as the Hurricane and Spitfire required 100 octane fuel, and that bases operating Merlin powered aircraft needed stocks of the fuel.