Broughton stamped his class on the John Smith's Scottish Triumph Hurdle Trial for trainer John Ferguson and jockey Denis O'Regan.
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The four-year-old won three times on the level for Mark Johnston in 2013, completing his hat-trick in a Glorious Goodwood handicap.
Having been beaten just a head by Fox Norton in the Grade Two Summit Juvenile Hurdle at Doncaster on his jumping bow, it was no surprise to see him sent off the 5/6 favourite for his Scottish assignment.
Clarcam took the field along, but Broughton had far too many gears in the straight and was pushed out hands and heels to take the prize by five lengths.
O'Regan said: "I was delighted with him. I wasn't sure if the trip would suit, because I think he would prefer a more galloping track.
"I think if he'd jumped a bit better up the straight at Doncaster he might have won, but he has come on a lot since then.
"You can only beat what's in front of you and we have to hope that he is going the right way. On better ground, he could be effective.
"He's got a great attitude and he could be one of the best four-year-olds we've got.
"I don't know where we go now. John Ferguson knows more about things like that than I do, so we'll have to see."
The winner was cut from 20/1 to 12/1 by Sky Bet for the Triumph Hurdle at next month's Cheltenham Festival and is also entered for the Sky Bet Supreme Novices' Hurdle, for which he is a 25/1 chance.