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One can see that the power figures were not pulled from a chart given the differing powers obtained:
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There you go, they are testing the engines on a bench at boost over-ride
on 87 Octane.
Everything in aviation related to the airworthiness is tightly controlled and must be specified. The Air Ministry documents the standards and conditions they expect their pilots to use down to the point of defining the standards they expect if a pilot violates the airworthiness standards in an life threatening emergency.
The RAF instructs its pilots to balance and evaluate risk before taking the risk of moving outside of the airworthiness instructions. From 1937 on, they are able to use boost override.
Without the specific mention of using +12, an anecdote that makes any reference to boost override, pulling the tit, boost cut out, or anything other term related to the system is irrelevant to the use of 100 Octane.