It doesn't say but its a common phrase to say in this situation. We do know that the Chief of the Air Staff had asked for fighter units to be equipped with 100 Octane. This request wasn't limited to Group or squadron or any other kind of boundary so I believe that the units concerned are the Fighter units.
I admit that its the sort of ambiguity that some people will try to build a lot on, but I cannot help what a senior civil servant wrote down seventy years ago and have to live with the consequences.
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