"In combat and emergency other considerations may justify the pilot in disregarding these limitations"
The Air Ministry gave license to violate the airworthiness of the aircraft. It is no wonder Dowding was concerned.
And yes, any pilot reading that would understand they do what they must to survive even if it means "disregarding these limitations" published in the Operating Notes.
There is no doubt that RAF pilots used whatever system was available to increase the limitations irregardless of fuel type.
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