Ok....Here is the knowledge guys......In answer to the question.....There isnt one
The drink driving limit is:
35 micrograms of alcohol in 100 millilitres of breath; or
80 milligrams of alcohol per 100 millilitres of blood; or
107 milligrams of alcohol per 100 millilitres of urine.
The limit cannot be safely converted into a certain number of units, as it depends on a number of factors to include gender, body mass and how quickly your body absorbs alcohol into the blood stream.
It takes one hour for a healthy liver to process one unit of alcohol. However, it does depend on your body mass, gender and how much food you have consumed. Also even if you feel fine after having a skin full on an evening, there is still a high possibility that you will be above the legal limit should you drive the following morning.
A unit of alcohol is measured by its size (ml) and strength (% alcohol by volume or ABV) of the drink.
One unit of alcohol is 10ml (1cl) by volume or 8g by weight, of pure alcohol.......Imagine the barmans face when you get your scales out to weigh your drink to make sure you are getting the right amount!!!!
A Pint of Beer is 2 Units, Large Wine just over 2 and a Spirit, one shot, is 1 Unit. Minimum Ban is 12 months...
You dont have to be driving, just in the car with the keys is enough, even if you are fast asleep, you could be nicked and face a court appearance for being in charge, then you have to show that you have no intention of driving....Not Good.
In my expierence, it wont matter what the limit is reduced to, the hardened drink driver always thinks he/she wont be caught, so the legislation has no effect on their consumption.
So in short....Its a guessing game, everytime you drink a few and drive....Emjays advice is spot on.