Lalor had was so impressive at Cheltenham when winning on his chasing debut with Dynamite Dollars seven lengths back in second - but Paul Nicholls did not shy away from taking him on again, and was duly rewarded.
Lalor never looked completely happy on much softer ground and going right-handed, as Diakali and Irish raider Ornua set a rapid early pace.
As Diakali dropped away, Ornua was left in front under Dylan Robinson, but Dynamite Dollars was stalking with Lalor struggling on back in third.
Jumping the last it looked as if Ornua may hold on, but Harry Cobden persevered on the 9-2 chance and he stayed on strongly up the hill to win by a length and three-quarters in a stirring finish to the first Grade One Novice Chase of the season.
Nicholls said: "It was impressive. It's amazing how five-year-olds improve. Last season he was a fairly ordinary novice hurdler and he has physically improved.
"When I saw him in the paddock at Cheltenham, I thought he didn't look that great, but today I said to Tom Malone, who brought Lalor up in the box, don't count him out, as he looks so much different today than he was the last time.
"He has just improved. He gallops, he stays, he's a proper horse. He jumps and stays, a real tough horse."
Published 14:45 08/12/18