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And how many units were actually flying the Mk1 in 1942, lol.
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Exactly Fruitbat....
It is an indicator of the importance of the change over to 100 Octane.
Do you really think if it occurred earlier they would not have immediately republished the Operating Notes?
Of course they would have republished them. It was a legal requirement from the Air Ministry by convention and our June 1940 Pilots Operating Notes would appear with the same notation for "ALL OPERATIONAL UNITS - 100 OCTANE ONLY".
The fact none of the operational documentation reflects that notation prior to January 1942 is a huge indicator.