The Power Maxed Racing driver had dominated proceedings, leading every lap but was handed a five-second time penalty late on for exceeding track limits one too many times.
Moffat originally dropped to fourth, promoting his team-mate Mikey Doble to first place, however following an appeal he has moved back to first place.
That means that team-mate Doble now moves to second place, and Tom Chilton to third. Moffat is now the 11th different winner of the season.