3️⃣ Where the rule does NOT work or works differently:

✔️ Appearance that cannot be changed in 30 seconds: Comments about hairstyle, makeup, figure, or skin condition are absolutely unacceptable. This is considered rude and an invasion of personal space. Here, the principle "If you can't fix it in 30 seconds, don't mention it" applies.
✔️ With management: Pointing out a minor flaw to a manager can be perceived as familiarity or disrespect, unless you have a very informal and trusting relationship.
✔️ With strangers: With strangers, the British are generally very cautious. Many would prefer to remain silent so as not to embarrass the person and avoid awkward interaction. An exception is if the problem is truly critical (for example, a piece of toilet paper trailing from someone's bag).