Not sure if this has been posted before:
In October 2011, the Licensing (Scotland) Act 2005 was amended by the introduction of a new mandatory condition for all premises licences and occasional licences. This provides that there must be an age verification policy in relation to the sale of alcohol on the premises.
The law has set a minimum age of 25 years for the policy where it appears to the person selling the alcohol that the customer may be under the age of 25 years.
As a result of this change in the law, customers in any premises in Scotland licensed for the sale of alcohol, including pubs, clubs, restaurants, supermarkets and convenience stores may be asked to produce identification where they appear under the age of twenty five to prove that they are over the age of eighteen and can lawfully purchase alcohol.
http://www.challenge25.org