Thanks for the excellent research guys, very interesting stuff indeed - especially the cutaway drawing showing the internal working of the boost control unit.
It has got me confused though as my Spit II manual seems to suggest that +7 was the maximum permitted boost for use with 87 octane fuel and that this was achievable without resorting to the boost cutout switch.
It only refers to using the boost cutout switch with respect to achieving the +12 combat boost value (restricted to 100 octane fuel).
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