It's already been pointed out that common sense has to apply here. There was high turnover of fighter aircraft during the BoB by all squadrons -- combat, accidents, engine/airframe wear & tear. There was no shortage of replacement aircraft. It stands to reason the replacement aircraft were factory-new and using 100 octane.
The airfields did NOT have two sets of fuel bowsers driving about the dispersal area looking to see who took 87 or 100 octane. There was a war on, fergawdsakes!!!!
