Edition: Singapore Indonesia Asia US/UK LONDON :Silverstone circuit could stay on the Formula One calendar forever with no real rival to host the British Grand Prix, the sport's chief executive Stefano Domenicali said on Tuesday ahead of this weekend's race. The Italian told reporters he could not imagine a championship without Britain, home to seven of the 10 teams, but there was also no chance of the country having more than one race. "I do believe that... Silverstone has the right