McLaren-Honda have been forced to curtail the first day of the F1 test in Barcelona after developing technical issues on the MP4-30.

Button had enjoyed a positive start to the day, briefly topping the timesheets at one stage and completing 21 trouble-free laps in the Honda powered car.

However, an issue with the seal on the MGU-K would occur shortly afterwards, the car spending a lengthy time in the pit lane before the team confirmed it would not re-emerge for the remainder of the day as a full power unit replacement is required.

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Up to that point, Button had lapped in a 1min 28.182secs, placing him less than a second off the ultimate pace in the run up to lunchtime.


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