 Complete the following phrase:  He raced an Alta Formula 2 in Europe for the 1951 season, switching to an HWM-Alta for the following season, planning to racing again in F2. When the sports governing body decided to change the World Championship regulations from Formula One to Formula 2, Gazes plans changed as well. He took part in a number of non-championship F1 events, and then in June travelled to the Circuit de Spa-Francorchamps for the 