[corin_]

UK actually went from "Challenge 21" to "Challenge 25" a few years after the former was introduced, so most places have a policy of asking for ID if you look under 25 now - a 7 year margin.

Though the extent to which staff really do challenge anyone who looks under 25 obviously varies considerably, even in businesses where Challenge 25 is the official policy (which afaik is a recommendation that most chains, including pubs and supermarkets, and many small businesses follow, but not a legal requirement).