The opportunist Cammish took advantage of a ferocious early battle between four-time and reigning champion Colin Turkington and Ash Sutton to wrestle the lead on the fourth lap, and stayed in front for the remainder of what turned out to be a 19-lap encounter.
As predicted – not least by Cammish himself – his front-wheel-drive Team Dynamics-run Honda lost a place at the start to the rear-driven Laser Tools Racing Infiniti of Sutton, while poleman Turkington established himself at the front in the West Surrey Racing-run BMW.
Turkington was soon under pressure, losing time at the chicane in particular, and on the fourth lap Sutton tried a brave move around the outside of Schwantz Curve.
That appeared to put Sutton in the clear as he was on the inside for the following McLeans bend, but he left a chink of light on the inside as he completed the move on Turkington, and it was filled in no time by Cammish.
Cammish clung on to the inside for Coppice, where a concertina resulted in contact from behind for Turkington from Tom Ingram, and the BMW nerfing the Infiniti of Sutton into a spin.
Turkington survived that incident in second place, while Rory Butcher inserted his Motorbase Performance Ford into third position.
The safety car appeared after 11 of the intended 16 laps, with Nicolas…