Section 4 "Instructions and Notes for Ground Personnel" mentions in Para 4
Quote:
The fuel ... to be used with the Merlin XII engine are as follows:-
Fuel .............. 100 Octane
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Section 8 "Engine Installation" was issued August, 1940 with A.L. No. 3 in Para 14 "Fuel System"
Quote:
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The fuel system ... uses 100 octane fuel ...
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The use of 87 Octane fuel is not mentioned in these sections.
It's obvious that the guidelines for the use of 87 Octane fuel were not contained in the initial issue of June 1940 and were added later.