It's at one 'alcohol unit', defined as 10g of pure ethanol. For comparison a standard 355ml can of 4.2% ABV beer (e.g. Bud Light) contains just under 12g of pur

It's at one 'alcohol unit', defined as 10g of pure ethanol. For comparison a standard 355ml can of 4.2% ABV beer (e.g. Bud Light) contains just under 12g of pure ethanol. A 5% ABV can would be closer to 15g. So the unit of measure they're using is bit smaller than what most people think of as 'one drink'.