Ian Williams charge swept past the favourite Western Leader on the run-in and burst six lengths clear of the Irish raider.
There was concern for Wayward Prince after the race, but Costello said: “He had dug deep and is just exhausted, he is fine really. This is one of my biggest wins along with Leslingtaylor when he won the Swinton Hurdle at Haydock.”
Williams said of the 9-1 winner: “He is a horse of real quality, we are only just seeing the start of him. He is bred to be a chaser and will go straight over fences next season.”
Nicky Henderson’s Burton Port has been a model of consistency this season and he recorded his fifth success from seven starts this season in great style in the Mildmay Novices’ Chase.
Having asserted going to the final fence, he kept up the gallop in good style for Barry Geraghty to score by three and a quarter lengths from Dance Island, contributing to a splendid day for owner Trevor Hemmings who also won the feature with Albertas Run.