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The gendarme can take administrative measures to protect the public, with the assent of the public prosecutor, once a person has been found at the wheel of a motor vehicle under the influence of alcohol. The driving ban taken this way cannot be longer than 6 months and will expire when the driver is judged in court.
1) Yes an arrest warrant will be issued and if taken he may be taken into custody and jailed until trial (up to 9 months). It is likely he will be arrested when going through customs and immigration in France or any Schengen zone country.
2) Pleading guilty or not is kind of irrelevant if he was taken into hospital and blood-tested for alcohol... If he does not go to court the suspension is likely to become a revocation and additional sentences might be hefty including jail. Beware that bilateral agreements between the UK and EU countries will make suspensions and revocations applicable back in the UK too...
3) Yes once the suspension period is over, as the court will determine. Beware it's not only in France but in all Europe.
4) If he does not show up in court, he won't be able to travel anywhere in continental Europe (Schengen Treaty zone) without facing arrest and extradition.