Ben Barker takes fifth win in a row under pressure from James SuttonAhmad Al Harthy takes Pro-Am1 after major battle with Derek PierceRichard Denny fends off Will Goff to head Pro-Am2 Ben Barker scored his fifth win a row in round 17 of the Porsche Carrera Cup GB at Silverstone on Sunday.In a race run in foggy conditions, Barker saw off a race-long challenge from James Sutton, while Michael Meadows took another step towards the title with a measured drive to fourth.With Rory Butcher claiming the final overall podium position, Ahmad Al Harthy consolidated his championship lead in Pro-Am1 after a fine contest with Derek Pierce, while Richard Denny clinched Pro-Am2 after a strong early challenge from Will Goff.With Silverstone shrouded in fog, the race start was delayed 45 minutes until visibility was good enough for racing. But the delay made no difference to Barker (Parr Motorsport) who got the jump from pole to head the field into Copse. Sutton (Redline Racing) slotted into second while Butcher (Celtic Speed) braved it out around the outside at Copse to grab third from Meadows (Redline Racing).Although Barker quickly established his lead at around a second, Sutton mounted a determined pursuit and pushed the leader throughout the 28-lap race. Several times the gap came down to only half a second, but Barker was driving superbly and never offered Sutton the smallest of opportunities. Even after 26 minutes of flat out racing, the winning margin was only three quarters of a second.We kept the ball rolling, said Barker after his fifth straight win. Weve really proven that weve clicked with the car. I was just trying to control the gap and a driver like James doesnt make many mistakes. Sutton, meanwhile, was equally impressed with his rival. Im a big fan of Bens driving: very clinical and controlled, said Sutton. Butcher slipped back a little in third, taking a well deserved podium after Meadows ran as a constant shadow. However, with the title uppermost in his mind, Meadows was not prepared to risk an attack on Butcher. I was never going to make a big move, confirmed Butcher. But I want to win the title by winning the second race, he added. Andy Meyrick fended off Team Parker Racing team mate Richard Plant to take fifth after a lengthy tussle.It was Pierce (JD Pierce with Parker) who stormed ahead at the start in Pro-Am1, but Al Harthy (Redline/Oman Air) raced very hard to get ahead of Oly Mortimer (GT Marques) and move in on Pierce. Ahmad came up very strong, said Pierce. Then I had a big oversteer moment at Copse and thats when he got the run on me to Becketts, said Pierce.With Victor Jimenez (Redline/Oman Air) up to third and chasing, Pierce fought back onto Al Harthys tail, but the Oman racer held on for an excellent Pro-Am1 victory. I lost two places on the damp side of the track at the start, but I managed to carve my way through, said Al Harthy. There was also a close contest in Pro-Am2 as Denny (Parr Motorsport) had to fend off a determined Will Goff (Goff Racing) for many laps. Eventually, Goff had a quick spin at Becketts when right on Dennys tail and that resolved the battle in Dennys favour. Will was right there for a long time, said Denny who later had a quick spin of his own, but held on for Pro-Am2 spoils.Round 17 results:Pro category: 1 Ben Barker; 2 James Sutton; 3 Rory Butcher.Pro-Am1 category: 1 Ahmad Al Harthy; 2 Derek Pierce; 3 Victor Jimenez.Pro-Am2 category: 1 Richard Denny; 2 Will Goff.