BTCC champion elect Colin Turkington says his gutsy drive to a Silverstone race three podium could prove 'season defining' after escaping in one piece from the drama.

For one lap during Sunday's final race, the size of Turkington's healthy points advantage hung in the balance when the WSR driver was embroiled in a pulsating four-way tussle for the final step on the rostrum.

As four former-BTCC champions - including Jason Plato, Fabrizio Giovanardi and Alain Menu slogged it out side-by-side for a near full lap, Turkington held his nerve and somehow came out on top to clinch third.

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Turkington now leads MG's Plato by a near unassailable 50 points heading to the Brands Hatch finale after also taking two second-place finishes at Silverstone prior to the third race.

"Yeah there's always one race in every season where it's a complete battle and defines the year," said Turkington. "I think that was one of those races for sure. Coming into the weekend I knew I had to keep the point's gap to Jason at a good buffer.

"Race three was one of those races where I was doing my best to limit the risk. I knew going in there three abreast somebody was going to come out of there not happy and I made sure I left room because the corner really funnels in. I managed to hit the apex but then got hit from behind and put Gio sideways.

"You need a quick car and you need to peddle it fast but sometimes you need the rub of the green too and I think we got that in race three."

Finally, despite leading the championship by such a margin, Turkington says he refuses to back off in any way for the final three-races, as the BMW driver believes a negative approach will only invite trouble.

"The approach has to be the same. We'll keep the same philosophy, work hard and try to be as fast as we can and go forward," he continued.

"We can't hang about and start to look in the mirrors because that's when you start to get into trouble. We'll try just to be the quickest car. Racing at the front is the easiest place to be. That's the plan."