Nick Tandy claimed a debut victory in the opening race for the Porsche Carrera Cup GB at Silverstone on his guest drive in the series.

Tim Harvey led the chase of the British F3 regular to take maximum points and move one point ahead of Michael Caine in the title race as Caine fought back to fifth after a spin.

In the pro-am1 category, Nigel Rice raced hard to close the points' gap to Tony Gilham to just eight with three races remaining. In pro-am2, a nicely controlled drive by Glynn Geddie took him to the top of the championship points as Paul Hogarth and Steve Rance chased.

Phil Quaife converted his pole position into a first lap lead as Tim Bridgman edged ahead of Tandy on the run to Copse. Just behind, Caine battled through to fourth from Sam Hancock and Harvey in a hectic opening lap.

Bridgman settled into second behind Quaife, but it went wrong for Bridgman as they completed the second lap. Quaife clipped one of the plastic corner markers at Woodcote, which flicked up and hit the radiator on Bridgman's car. With coolant spraying onto a front wheel he spun at Copse.

"I thought I'd got a rear puncture," said Bridgman, who drove back to the pits, leaving coolant around much of the lap.

Quaife was the first to find the coolant at Becketts and ran wide, allowing Tandy into the lead, while Hancock lost time and Caine spun as he hit the slippery corner. Harvey, however, picked his way through the drama and was able to battle back in front of Hancock as they both close in on Quaife.

"I had a great start and everything looked good," said Quaife. "Then the power steering pump started playing up and from then on I was just hanging on for dear life."

Lap by lap, Harvey hunted Quaife down and went ahead on lap twelve as Quaife struggled. Hancock later caught his team-mate and took third after a close battle between the pair of Jota Sport cars. But up front, Tandy reeled off the remaining laps for an impressive victory, as Harvey took second on the road and maximum championship points.

"They race you really hard," said Harvey of the young guns on the grid. "But it's maximum points, which is really important."

Having lost a lot of time with his spin. Caine managed to fight back to fifth despite some gearbox problems. In the closing stages he caught the battling pair of Rice and Charles Bateman and Caine's progress up the order was boosted when Bateman clipped the back of Rice's car and damaged a radiator. Rice duly took sixth overall and pro-am1 spoils, as well as closing the gap on Gilham in the points.

"I could have done with Bateman finishing between us," said Rice, who is now only eight points behind Gilham.

Into seventh with an excellent debut drive came Sean Paul Breslin, having gone ahead of Gilham when the ReDesign car spun on the fluid from Bateman's car at Luffield and stalled. "I had a job to get it started again," said Gilham after claiming eighth overall and third in pro-am1.

In pro-am2, Geddie always set the pace, but his team mate Rance was a constant shadow. "It was a controlled drive; I was just measuring my pace," said Geddie. However, Rance got close enough late in the race to try a dive at Brooklands, but his car spun and that allowed Hogarth through to second after an excellent run.