 The decision taken was that there would be an initial delivery to 16 fighter and two twin-engined bomber squadrons by September 1940.However, this was based on a pre-war assumption that US supplies would be denied to Britain in wartime, which would limit the numbers of front-line units able to use the fuel.On the outbreak of war this problem disappeared; production of the new fuel in the US, and in other parts of the world, increased more quickly than expected with the adoption of new refining techniques.