Flock scored an 11th win of the season in the opening race in Norfolk and, despite a spin in the second contest, he threatened main rival Cameron Pratt-Thompson but could not quite find a way through to score another triumph.
Nevertheless, he still improves on the leaderboard moving into ninth, and is now five wins shy of the tally of table-topper Freddie Slater - the Ginetta Junior ace impressing on his British Formula 4 debut at the weekend.
