World champion Jenson Button sets fastest time of the eight pre-season testing sessions . British driver tops timesheets at Jerez on Saturday for his new team McLaren . The first day of practice was marred by a crash between Fernando Alonso and Felipe Massa in which both drivers suffered minor injuries but neither had to leave the track as they were able to continue with their preparations Struggling new team Campos confident of competing after naming new team boss .
World champion Jenson Button sets fastest time of the eight pre-season testing sessions . British driver tops timesheets at Jerez on Saturday for his new team McLaren . Teams head to Barcelona next week for final sessions before first race in Bahrain . Struggling new team Campos confident of competing after naming new team boss .