I think there's a way to prove the majority of bases were converted, but it'll be time consuming.
Cross reference the combat reports from the battle mentioning 12lb boost, with the squadron involved, to the movements of that squadron for that date. ie. where were they, a: stationed? and b: where they scrambled from? (not always the same station).
In the past I counted at least 30 squadrons refering to 12lb boost in combat reports between May - July 1940.. That's nearly half of all FC's squadrons.
Add that to the fact that there were only around 30-32 'operational' stations being used at the time, and the rotation system, it would suggest widespread use of 100 octane.
Also does anyone know if you could actually run a converted Merlin on 87 oct?
If it was a case of just swithcing fuels then why the modification to the engine?
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