The trouble is knowing how many units one is actually consuming, a small glass of wine is one unit but it may be considerably higher than that depending on the strength of the alcohol content and the same goes for beer. Of course, better not to drink and drive at all, and not even a very small one if we dont know the strength of the alcohol we are drinking.
As a driver I know I can rely on myself but if I'm being driven then I certainly don't want a driver who has been drinking at all. I welcome this own breathalyser French law and I honestly think it should be introduced here in the UK. It hopefully might make drivers more alcohol aware.
I love driving on the other side, find it much easier
