Bernie Ecclestone confirms F1 denied 100th race start for McLaren after ERS failure . Button then spent much of the Bahrain Grand Prix on Twitter delivering his verdict on the action as it unfolded . Lewis Hamilton has out-qualified and finished ahead of Mercedes team-mate Nico Rosberg at every race this season . Jenson Button will make its bow in Azerbaijan next season .
Jenson Button denied 100th race start for McLaren after ERS failure . Button then spent much of the Bahrain Grand Prix on Twitter delivering his verdict on the action as it unfolded . Lewis Hamilton has out-qualified and finished ahead of Mercedes team-mate Nico Rosberg at every race this season . Bernie Ecclestone confirms F1 will make its bow in Azerbaijan next season .