What had been a testing and somewhat bizarre week for Aidan O’Brien and the Coolmore partners last week ended on a much brighter note when St Mark’s Basilica led home Wembley in a Ballydoyle one-two in the Dewhurst Stakes at Newmarket on Saturday.

Seven days earlier, O’Brien had to withdraw all of his horses from the Arc day card at ParisLongchamp, including the aforementioned two, after it had emerged that there were traces of zilpaterol found in feed supplied to Ballydoyle by Gain equine nutrition.