Winny,
The Operating Notes say that in the January 1941 edition. None of the earlier editions make any note of it at all under operating limitations. 100 Octane is a minor footnote of "may be used.....IF converted" in all previous editions of the Operating Notes.
It is a fact the RAF did not complete conversion to 100 Octane until around January 1941. That is evident in the Operating Notes.
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