dot has given the correct answer to the question as you have phrased it.
Prior to the 2003 Act it was illegal to sell alcohol to a minor - the seller committed an offence but the minor did not. Now it is also an offence for a minor to attempt to purchase alcohol.
Nice try dot, but it still doesn't answer the question. I am sure you know what I mean by the question. It cropped up in the pub, where else, a few days ago, and intrigued a few of us who have all been guilty albeit many years ago. :-)>