I'd tend towards a "fail", myself, for typo on the rating.
Probably he wouldn't be allowed to do this, though. He's a tradesman with the (equivalent of) a "may do PAT" course.
AFAIK, he did the reasonable thing: Took the hair thing, asked, then returned it to the owner, and said, it's electrically fine but you can't use it at work, fails our testing standards.
Apparently he's also required to fail extension leads that lack a notice saying "do not daisy-chain extension leads". This is in a sensitive residential setting: living quarters where some residents have "issues". So they err on the side of caution...
Thomas Prufer