FERRARI'S Carlos Sainz claimed his first Formula One victory in a thrilling British Grand Prix halted by a first-lap crash and with the added mayhem of a track invasion by environmental protesters. Red Bull's Mexican Sergio Perez was runner-up, 3.779 seconds behind the Spaniard, with seven-times world champion Lewis Hamilton third for Mercedes in his home race and taking fastest lap for a bonus point. "Yes! We did it! Vamos!" exclaimed a delighted Sainz over the radio after a win that had looked unlikely despite him starting on pole position for the first time and in his 150th race. "I…