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EddieM
Each ID card (specially produced and paid for by the alcohol industry) should have a bar code so that a system logs every time the card is used. This has the advantage of flagging up overuse (or abuse) if it is, for example, scanned many times in one 24 hour period.
I still like my idea that you have to be registered with Inland Revenue in order to buy alcohol. The POS adds a premium to any alcohol sales (to put off underage or non-tax-paying purchasers) and it is refunded by the IR every quarter.