West Surrey Racing's Andy Priaulx admitted he had to 'fight hard' in order to keep up and pass Motorbase Performance's Mat Jackson to win the second British Touring Car Championship race at Silverstone.

The BMW 125i M Sport driver got the better of Motorbase's Jackson during the eighth lap of the race before the Ford driver subsequently fell down the order with an untimely puncture.

"Excellent win. I think that was number 50 of my career," said Priaulx. "I've got to check because there's a few figures being thrown around. Really happy."

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"It was a tough race and I had to fight hard to stay with him and then pass him. I was hoping his tyres would drop more and more during the race but I felt he actually improving as the race was developing.

"I really had to push and I saw my opportunity at Copse. He had his moment, lost the rear and there we go. I think had two wheels on the kerb and we were side-by-side. He overcorrected so I decided to pounce on that."

During Priaulx's move for the lead, the BMW driver appeared to come perilously close in putting all four-wheels over the white line at Copse while moving ahead of Jackson's Ford Focus.

However, while some queried the legality of his move, Priaulx maintains he did everything by the book.

"I think Mat [Jackson] lost the rear of the car, which meant I closed really close and I had nowhere to go so I had to actually avoid him to be honest. I wasn't wayward, it was marginal," said Priaulx.

"I looked in my mirror for the next five laps and he was constantly four wheels over the line so I don't think I gained any advantage over that. Jackson already made the mistake mid-corner.

"I did mention it over the radio but there was no need to do anything after looking at it on the TV. Normal racing, no worries."

Priaulx had begun the day at very back of the grid but used the first race to good effect to set a time good enough to put the triple world champion back into the mix for race two.

The WSR driver was already destined to start from the back of the field from his resulting penalty carried forward from Knockhill but Priaulx said his Saturday program became compromised due to a broken roll bar.

"We know this track isn't our best. We had an issue yesterday with the roll bar. The roll bar broke in qualifying so coming into the race I didn't know how good my car was going to be because it was a problem we developed all the way through FP2," Priaulx continued.

"Race one was a little bit of a worry but we had a good balance and did the lap with a good slipstream. We know we're not strong here on the long straights but if you can get in the tow, great.

"The only problem is that it's a big car and guys behind also get dragged along beautifully by us. I'm sure we're the best slipstream donor in the pit-lane!"