0.2 is less than half the 0.5 limit for driving a car in most of Europe. I believe the 0.5 limit can be easily breached by a man having 2 pints of beer. So one unit of alcohol (roughly) in your system will probably put the average man over the flying limit, guranteed for a woman. The average human body removes one unit per hour from their system, average pint or small glass of wine is 2 units.