It's all unbelievably complicated, and this is seems to be one of the first times the rules have been tested in court.
Planet Ski's excellent round-up describes Simon Butler as "Marmite Man". They quote an ESF director who calls him a "white collar hooligan". On the other hand UKIP's Paul Nuttall condemns what he sees as "a blatant display of national discrimination by the French Government".
Boris Johnson is also outraged - and the whole controversy has not gone unnoticed in the French press - see, for example, these piece from Le Figaro and Le Parisien, and this report from France 3 News.
The British Association of Ski Instructors (BASI) is not supporting Mr Butler. As The Independent asks: Is Simon Butler a national hero, or just a skier who breaks France's rules?
An appeal has been lodged, so the saga looks set to continue...
In a separate development, there is potential trouble brewing for the Ski Club of Great Britain, following the questioning of one of its hosts on the slopes of Val d'Isere last season - the Planet Ski report is here.