He struck first on the Jonjo O'Neill-trained Dream Again Boys (9/2), when sending him on a long way out to claim the Lindley Group Event Caterers Handicap Hurdle by nine lengths from Pension Plan.
McCoy said: "I didn't mean to ride him that handy. We were doing a little bit too much. I thought I would have him up there and hold on to him as long as I could. He coped with the ground and others didn't. It's as bad a ground as you could race on."
McCoy doubled up with a cheeky success on The Bear Trap (11/2) for Rebecca Curtis in the IWEC Electrical Handicap Hurdle.
He bided his time in the unforgiving conditions on the JP McManus-owned six-year-old, who was having his first run since April, before heading Hassadin on the run-in for a two-and-a-half-length verdict.
Curtis had earlier won with Bob Ford (4/1), who ran his rivals ragged to take the Stradley Park Maiden Hurdle under Tom Scudamore.
McCoy is about to add another feather to his bow as it has been announced that he has been commissioned to write a novel.
Orion Publishing has bought the rights for a McCoy-penned racing thriller, due to be released in hardback in November.