Middle Eastern oil was already part of naval fuel planning

How would discovering major Middle Eastern oil reserves in the late 1920s have changed the Second World War?

Iranian reserves were already known and exploited for British naval fuel, so the proposed discovery does not establish a new timeline. Earlier discovery of North Sea or Libyan oil is suggested as a more substantial alternative.

A late-1920s discovery of major Middle Eastern oil reserves is challenged as the point of divergence. Iranian oil reserves were already being exploited and linked to fuel supply for the Royal Navy. British imperial involvement in the Persian Gulf is therefore part of the existing situation. Earlier discoveries of North Sea or Libyan oil are suggested as alternatives that could produce a larger change. Those possibilities receive no developed account of production, control or wartime access.