If you are driving a bus, taxi, hire-car, heavy motor vehicle (over 13.9 tonnes Gross Vehicle Mass), or a vehicle with a dangerous load, it is an offence when the level of alcohol in your blood reaches:

• A. 0.08.
• B. 0.02.
  Explanation:

  "The level is 0.02. This means there is 20mg of alcohol per 100ml of blood. Although, bear in mind that any alcohol in your system will affect your ability, even if you can't notice it."
• C. 0.05.