Button was already at the back of the grid, thanks to his failure to set a qualifying time, and now faces an even tougher race, thanks to McLaren replacing the turbo and MGU-H on his MP4-30 - both his fifth of the year. Regulations stipulate teams may use no more than four per season.
Using the extra engine elements means a 15-place grid penalty (10 places for the first element, and five for the second), but as Button is already last in the starting order, the penalty is converted to a drive-through penalty which must be served in the opening three laps.
