The Government’s recommended daily unit guidelines are up to 2-3 units for a woman and up to 3-4 units for a man. One unit is equivalent to 8g of alcohol. That’s about what you get in half a pint of a weak (4%) lager.
A whole pint of strong lager (5%) or cider contains three units. Two small (125ml) glasses of wine (12%) are another three units. Binge drinking as been defined as drinking double the daily recommended unit guidelines.
NHS Information Centre, Statistics on Alcohol: England, 2008