The 20 year-old becomes the youngest winner of the event in 26 years.
The Englishman held off a spirited fight back to add to his previous victories in 2015 and 2019.
The “Jester” claimed the £70,000 top prize and raised the trophy aloft in Milton Keynes.
It’s a third UK title for the Australian, adding to his prior successes in 2013 and 2015.
The world number one has won both Home Nations series events this season.
It was the Northern Irishman’s first tournament victory on the Main Tour in almost two years.
It was the third edition of the tournament this calendar year and the first ever to be attributed ranking points.
In victory, the Englishman becomes the first player to win three Home Nations events.
The “Jester” relied on all of his battling qualities to secure victory in the first completed ranking event of the new campaign.