The emerging story of a splinter quintet of Irish racecourses breaking from a lucrative media rights agreement took an unusual turn on Tuesday evening. Having had grievances for some time with how Horse Racing Ireland (HRI) divvied the riches it had negotiated on its behalf and that of the Irish tracks, the paradoxically named United Irish Racecourses (UIR) had opted that day to go its own way. This in isolation is not extraordinary. “I think there is no reason that racetracks shouldn’t be able to decide which broadcaster they go with,” a British industry insider told The Currency. “It works…