“The study by the [Schools Health Education] unit, based on data collected from more than 83,000 children aged between 10 and 15, found four per cent of children aged 12 or 13 had drunk 28 units or more of alcohol in the week before they were questioned – exceeding government limits for adult men, who can safely drink three to four units a day.”
The Schools Health Education Unit (SHEU) can be found here – there are plenty of feeds of education data.