2012 Walter Hayes Trophy, November 3rd/4th 2012, Silverstone, Northamptonshire © Lynne Waite and Stella-Maria Thomas Team USA brought home a surprise victory at Silverstone this afternoon when the twelfth Walter Hayes Trophy again provided thrills and spills galore, the title eventually going to Tristan Nunez and Cliff Dempsey Racing, the youngster proving himself a match…