Grand Prix, and then third for the Dutch Grand Prix. He then took second place in the season-closing United States Grand Prix. In 1974, Postlethwaite designed an all-new car for the team, the Hesketh 308, which was ready for the Silverstone International Trophy, which Hunt won, making its championship debut at the South African Grand Prix. The car was strong, taking third place at the Swedish Grand Prix, the Austrian Grand Prix and the United States Grand Prix. For 1975, examples of the 308 were sold to Harry Stiller Racing, who gave Alan Jones his grand prix debut. Polar Caravans also purchased a Hesketh chassis, while the works team modified the 308 for Hunt. At the same time, Horsley was developing into an efficient and competent team manager and under his guidance, the team moved forward. Hunt won the wet-dry 1975 Dutch Grand Prix, holding off Niki Lauda's dominant Ferrari, and also led at the British Grand Prix and the Austrian Grand Prix, taking several placings on his way to fourth overall. Post-Hunt In late 1975, Hesketh announced that he could no longer afford to try to produce the next British world champion, having raced without sponsorship, and ended his involvement with the team. Hunt was offered the lead drive at McLaren, replacing Emerson Fittipaldi. Postlethwaite took his upgraded 308C design to Wolf–Williams Racing. Horsley upgraded the 308 to the 308D and continued as Hesketh Racing. Harald Ertl signed to drive the car, with the team's image landing Penthouse Magazine and Rizla as sponsors. Guy Edwards joined in a second car from the Belgian Grand Prix onwards with Alex Ribeiro bringing in some funds later in the year. Ertl's seventh place at the British Grand Prix was the team's best result of the year. Future Williams engineer Patrick Head noted that the 308D had significant aerodynamic issues at the rear of the car which hindered performance. Frank Dernie designed the new 308E chassis for the season, with Rupert Keegan driving alongside Ertl. Later in the season a third car was entered for Héctor Rebaque, with Horsley simply trying to bring in money to the team. Ertl left and was replaced by Ian Ashley, but by now Keegan's was the only entry that usually made it to the grid, and his seventh place at the Austrian Grand Prix was the team's best finish of the year. In the team slimmed down