firstly, i'm a coach driver who goes over the water a fair bit
secondly, if you bought breathalysers, you've just wasted your money.
as has been mentioned, it is law to carry 2, however there is no financial penalty if you don't.............great laws the french!!
you only need hi vis if you're going on the motorway, you must have FA kit and spare bulbs.
obviously you need ALL your docs with you at all times (don't leave the scooter docs in the motorhome
)