Jenson Button was one of several former Formula 1 world champions watching on at Silverstone on Sunday. He witnessed Lewis Hamilton win his record ninth British Grand Prix after a phenomenal performance across the weekend to finally end his wait for another victory. Several other drivers will believe that they should have been standing on the top step of the podium after a weather-affected race. George Russell couldn’t convert pole position into victory due to a mechanical failure and Lando Norris will be rueing the decision he made during his final – poorly executed – pit stop. However, speak…