AIDAN O’Brien is well established as the dominant Irish trainer both at home and abroad and 2015 was another successful season for him. O’Brien was responsible for no less than 21 two or three-year-olds rated 110 or higher in 2015, consisting of 10 two-year-olds (nine in 2014) and 11 three-year-olds (12 in 2014). One area that he didn’t enjoy as much success in was amongst the four-year-olds and older, with him saddling just three such horses that achieved ratings of 110 or over compared to 10 of them in 2014.