Jenson Button says he is already seeing significant strides being made by McLaren and Honda ahead of the critical second test of the 2015 Formula 1 pre-season in Spain.

The Englishman got his first run in the new Honda-powered MP4-30 in Jerez and though the test was beset by niggling issues, the most experienced driver on the F1 grid identified genuine improvements over the course of the four days.

Indeed, Button praised the close relationship McLaren has established with Honda, labelling it as 'a proper car', rather than merely being a 'constructor and engine supplier' partnership.

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"The first test in Jerez was very emotional and it was a really nice feeling to be working as one. As we know testing is all about improvement and that is what I felt we did in Jerez. There was an improvement in the way that we were working together as well as the direction we were taking.

"The engine and the package really did feel as one rather than a car and an engine. It is a proper car which is great. I'm looking forward to the next two tests and hopefully we will arrive in Melbourne ready to fight for the best result."