The five-year-old cost leading owner Michael Buckley €140,000 after placing in two Irish point-to-points last spring, but was a beaten favourite on his first two starts under Rules.
He was the 15-8 market leader to make it third-time lucky in the Best Odds Guaranteed At 188Bet EBF 'National Hunt' Novices' Hurdle in the hands of crack conditional James Bowen.
And despite showing signs of inexperience on the run-in, he ran out an authoritative length-and-three-quarter winner over Alan King's Herewego Herewego, the mount of Barry Geraghty.
Henderson said: "Unfortunately, there was a 140-rated horse (Knight In Dubai, finished fourth) in the race and that was not how to get into the Final off 130!
"I was pleased with him and I thought James gave him a good ride.
"He was green but he is a nice horse and he will have been helped by stepping up in trip.
"We bought the horse off Barry Geraghty and he has just finished second to him."
Henderson's former assistant Ben Pauling got off the cold list with a treble at Southwell on Monday and continued his revival by saddling Oistrakh Le Noir to land the Enhanced Place Odds At 188Bet Juvenile Hurdle.
The French import was fortunate to finish a close second on his British debut at Ascot last month after the two horses that looked set to fight out the finish came to grief at the final flight, but he was nevertheless a warm order as the 4-9 favourite for his second start.
Those who took the cramped odds will have had few concerns for the duration of the two-mile contest as Oistrakh Le Noir jumped well in front under Daryl Jacob on his way to a four-and-a-half-length success over Antunes.
Pauling said: "We were disappointed with him at Ascot, but I've been pretty open about the fact our horses weren't right at the time.
"This horse actually hasn't looked that different at home, but he's obviously a much better horse now. That's part of being a trainer, I suppose.
"He's not entered in the Triumph Hurdle but the Fred Winter is a possibility.
"We were on the cold list, had three winners yesterday and one today and now we're on the hot list. That's racing, as they say."
Select any odd to add a bet