Autosport Caterham Superlight Challenge-title winner Graham Fennymore, from Weston-on-the-Green, put in a champion's drive in streaming wet conditions to win Friday's penultimate round at Brands Hatch.
In the R400 class, season-long rivals Jack Newland, of Bicester, and Patrick Gormley took a win apiece with the championship crown decided in Gormley's favour on the final lap.
With the title sewn up, Fennymore had no need for heroics in Friday's penultimate round.
But he produced them nonetheless, scything past Guy Harrington through Paddock on the third lap and into the lead which he held for his sixth victory.
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