Behind them, Noriyuki Haga stayed out of trouble for fourth position, the Japanese rider bringing himself up to within a point of the crucial sixth place in the overall standings.
A race of high attrition, as well as Laverty, Lowry and Lowes crashing out, Alastair Seeley and Jon Kirkham retired from good positions with technical issues, while Tristan Palmer was also on course for a top ten finish when he slid off the GBmoto Honda.
As such, James Westmoreland came through for a second consecutive top five finish, the WFR Honda rider just keeping a fast-approaching Tommy Bridewell at bay. The Supersonic BMW rider had started a lowly 17th but picked his way up the order to finish in sixth place, in turn moving himself up to fifth in the overall standings.
Shrugging off his foot injuries, Chris Walker was a noteworthy seventh on the Pr1mo Bournemouth Kawasaki, just ahead of Peter Hickman, who turned his fine qualifying performance into Buildbase's best BMW result in eighth place.
Graeme Gowland made it two WFR Hondas in the top ten in ninth, while Hickman's team-mate Barry Burrell made it a day of success for Buildbase BMW in tenth position.
Rounding out the points' paying positions, Patric Muff crossed the line 11th, Luke Quigley 12th, Scott Smart 13th, Michael Rutter 14th and Mark Aitchison 15th, the latter picking up a point on his BSB debut aboard the Quattro Plant Kawasaki.
Looking ahead to the second race, Lowes starts from pole position, with Hill, Haga and Byrne making up the front row, while Brookes is joined by three non-finishers - Seeley, Laverty and Lowry – on row two.