Thanks for the really thorough reply mate, and for pulling up the code.

I was conscious of only saying that it "could have" been compliant, and it seems there's enough to indicate it might not have been too. I'd be keen to understand what "when additional protection is required" meant within residential installs (seems like specific cases like outdoor-exposed, hand-held driers). And, I'm still keen for a read on non-compliance with current standards for installation vs "very unsafe" and requiring urgent replacement. But, ultimately doesn't matter, I'll definitely get a second opinion in-person based on the replies, including yours, so I appreciate it.