AIDAN O’BRIEN’S season burst into life with a big race double at Chester.
He took both the feature Chester Vase and Cheshire Oaks with Changingoftheguard and Thoughts Of June, his first two winners in England this season.
Changingoftheguard booked his place in the Derby with a straightforward victory in the recognised trial and was trimmed into 10-1 from 50-1.
Hot favourite New London flopped and never picked up with Charlie Appleby’s colt pushed out to 16-1 from 5-1 second favourite for the Epsom Classic on June 4.
O’Brien said: “He was impressive and we always thought he’d stay well.
“There was no doubt he would take a step forward from his last win and improve for going up in trip.