 Complete the following phrase:  Hill has raced both cars and motorcycles at the Goodwood Festival of Speed, and in 2005 he tested the new GP2 Series car. He drove the Grand Prix Masters single seater racing vehicle for a test run around the Silverstone Circuit in mid-2006. He had discussions to join the series limited to retired Formula One drivers who were aged 45 or over but these talks did not materialise in a drive. Hill served as the driver representative on the stewards panel at the 