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That's as may be, but since we have no concept in this country, legally, of pre-crime, it seems wrong to assume that an offence will be committed and treat me as a potential criminal.
As far as I can tell, the law only asks that if someone is attempting to purchase alcohol then one should be sure that they are over 18 and, if there is doubt, then you should ask for ID. Merely being in the premises doesn't look to me like reasonable grounds to suspect that they may be attempting to drink alcohol.
I'm wanting to know if my legal understanding is correct, or not (it very possibly isn't), but regardless it's a sad state of affairs when you need to prove you are overage without having any intention whatsoever to drink alcohol. I can barely touch the stuff.