Subaru's Jason Plato has secured a dramatic British Touring Car Championship pole position after producing a last-gasp flier at Knockhill.

The former double BTCC champion saved his best until amidst the ever evolving conditions to snatch a landmark 50th pole in the series. It marks Plato's first pole position in exactly a year, where he achieved the same feat at the same venue.

With a significant downpour hitting the circuit minutes before the 30-minute shootout started, conditions rapidly improved in the second half of the session, which created a highly unpredictable climax to the session.

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Reigning champion Gordon Shedden was the first to get the ball rolling after setting the initial slick tyre pace. However, the timesheets tumbled on multiple occasions as the dry-line became ever more prominent.

Plato timed his last lap to perfection and was the last of the pole-position contenders to cross the line and subsequently set a 52.579 effort.

That was enough to displace his in-form team mate by the slimmest of margins while Team BMW's Colin Turkington and Rob Collard completed an RWD top-four order.

Technical gremlins for Collard made his run to fourth all the more impressive after the BMW driver spent most of the session parked in the garage as his West Surrey Racing squad rectified an undisclosed issue.

Speedworks Motorsport's Tom Ingram was the only non-RWD runner in the top six after setting the fifth fastest time ahead of Subaru's James Cole in sixth.

BTCC rookie Senna Proctor delivered an impressive performance in seventh position for Vauxhall, marginally ahead of home favourites Dave Newsham and Gordon Shedden in eighth and ninth.

Ciceley Motorsport's Adam Morgan was the final top-ten runner in tenth.