You could look at the PM deciding that the works do not meet the condition for a key date and then changing that decision (clause 25.3) or perhaps changing a decision on the date for Completion (clause 30.2). These both specifically refer to decisions of the PM. However, I think for 60.1(8) you are looking more broadly than a contractually specified "decision" and looking at any time the PM makes a decision in the normal English sense of the word.
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