More specifically, 6 out of 22 will ask to see it then sell to you, and 7 out of 22 won't ask at all. Bear in mind (in case it escaped your attention) that this is a 'King of the Hill' ID featuring Bobby Hill, and the ID says the boy sent in to buy booze was 17. 

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The legal drinking age in the UK is 18. 

Perhaps it's just because they don't take this sort of enforcement as seriously over there because far less people drive drunk. I believe that's the case, so it's not so surprising that they don't take the age requirement seriously, but it sure is funny nonetheless. How did they land on Bobby Hill? Congrats to the minds behind this sting for finding the funniest character ever to put on the ID.