T he racing industry is such a broad and varied collection of professions, venues and interests that at times it can feel like the Holy Roman empire: there is always a turf war or two going on somewhere, but never to such an extent that the whole thing falls apart. Ascot’s announcement on Monday that it will quit the Racecourse Association (RCA) at the end of the year, however, feels like more than just another localised dispute. The email dropped at 9am on a bank holiday, as if to underline that the king’s track means business, and where Ascot has led, others may follow, putting the future of a trade association that dates back to 1907 in serious doubt. The spark that lit the fuse, just two months ago , was Charles Allen’s departure as chair of the British Horseracing Authority (BHA), after a brief and ultimately fruitless attempt to impose a modern governance structure, including a fully independent board of directors, on Britain’s second-biggest spectator sport.…