He scored 11 victories during the season, and was able to win the championship by 62 points ahead of Ryuichi Kiyonari, a three-time series champion.
Third place in the championship was decided in the final race between Milwaukee Yamaha team-mates; a third-place finish for Tommy Bridewell, compared to a fifth place for Josh Brookes, allowed Bridewell to take the position by three points.
Outside of the Showdown, Stuart Easton was the winner of the BSB Riders' Cup, finishing in seventh place in the overall championship standings.
Ellison started the season with six successive podium finishes and had been in contention to make the Showdown, but he was forced to miss several rounds after a crash at the second Brands Hatch meeting which resulted in a broken femur.
The only other riders to win races during the season were three more first-time winners in the series; Tyco Suzuki rider Josh Waters won at the second Brands Hatch meeting, Peter Hickman won at Cadwell Park for the RAF Reserves team – having replaced Simon Andrews in the team, after his death at the North West 200 road race in May – and Quattro Plant Kawasaki's Howie Mainwaring won the opening race of the final Brands Hatch meeting.