 Complete the following phrase:  In 1968, Siffert drove into the F1 history books by winning the 1968 British Grand Prix at Brands Hatch in Rob Walker Racing Teams Lotus 49B, beating Chris Amons Ferrari into second place after a race-long battle. This is regarded as the last GP victory by a genuine privateer. In 1971 as a BRM team driver he scored his second Formula One Championship race victory at the 