Jenson Button feels McLaren are re-energised thanks to the introduction of Honda ahead of the 2015 F1 season.

At the launch of the all-new McLaren-Honda MP4-30, the former world champion said he is desperate to get going for the new season and has been impressed with the work the Woking-based team have completed over the winter.

"It's been interesting to spend time in the factory during the past few weeks," Button said. "You can really sense a feeling of reignited optimism and positivity around the building. I've never seen such motivation amongst the guys - we're all massively keen to get going in Jerez and to work hard on developing our new car."

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Despite Button's renewed confidence in McLaren, he admitted it will be very difficult to get the new car up to speed for the first official F1 test in Jerez which starts on Sunday.

"But we're under no illusion that it will be easy - there's a huge challenge ahead of us to try to pull back the gap to our rivals, but we're certainly up for it," he added. "We ended last season with great momentum and clear progress, and I'm determined to carry that forward into 2015."

The 35-year-old feels 2015 is the beginning of a new chapter in his life after McLaren announced a new two-year deal with the British driver. Button will team-mate Fernando Alonso, who has re-joined the team for a second stint after racing for one season in 2007.

"The off-season has really brought about a sense of renewal coming into 2015 - continuing my relationship with McLaren, getting married, and now embarking on such an exciting chapter: McLaren's new partnership with Honda. I've trained hard over the winter, and I'm absolutely itching to get going in the new McLaren-Honda MP4-30."

"I'm also looking forward to working with my new team-mate and I'm confident that our joint experience on track will pay dividends in our development race to get our team back to the front of the grid."