It said it retained confidence in the follow-up testing procedure in place at the time.

The effect will be to lower the de facto limit for drivers who have had half a pint too many, as it will reduce delays to the testing procedure.

For example, heart patients with coronary artery disease go through a lengthy testing procedure.

Each variety prepared by large scale manufacturers also go through a rigorous testing procedure.

Claimants are able to influence all aspects of the testing procedure and participants during the initial negotiation phase of the challenge.