Jenson Button says he can take heart from the fact his upgraded Honda power unit seems more competitive, even if persistent technical issues would consign him to the sidelines in qualifying.

In what has been a torrid weekend for the former champion so far, Button had already been forced to sit out FP1 and much of FP2, before signal problems on the Honda power unit sidelined him in FP3 and then qualifying as well.

Nonetheless, despite limited mileage, Button stuck with the line that he would rather suffer with reliability problems if the engine was quicker, saying he isn't 'too disappointed' as a result.

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"Definitely seeing progress with the power unit - we were eighth and ninth in FP2 with limited running so it's definitely getting there but obviously we have other issues.

"I would still rather have some reliability issues and have power, so I'm not too disappointed."

Looking ahead to the race, Button is anticipating an understandably 'tough' race, not least because he will need to revert back to his former power unit.

"It's going to be a tough day because I haven't done any high-fuel running or anything, so we'll see. All weekend it's been tough, we've had a lot of issues. I've done hardly any running really.

"We had a systems failure with this power unit so it means that we have to revert to the other power unit for the race, so I missed qualifying."