Jolyon Palmer had the honour of seeing his name atop the timesheets following the final day of in-season F1 testing at the Circuit de Catalunya.

A full day of track action for the Lotus test driver, Palmer worked on aero runs in the morning before switching to set-up work in the afternoon, during which he was able to use the super-soft tyres for two quick runs at the end.

Making the most of the favourable rubber, Palmer subsequently went quickest of all in the Mercedes-powered E23, much to his delight.

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"It was great to be in the car for a full day of productive testing especially here in Barcelona where I tested in the pre-season and then drove in FP1," he said. "I think we've made real progress as a team with the set-up of the car and I know I'm improving every time I get in the car. We ran through a lot of different programmes and assessments and it was a great day at the office for me."

Having run during FP1 in China, Bahrain and Spain, defending GP2 Series champion Palmer was pleased to be getting an extended outing in the car for the test, adding that the terms of his deal with Lotus was dependent on him getting track action.

"I prefer Friday's because in some ways it's more competition, it's part of the race weekend so it's more focused and it's 90 minutes where the spotlight is on you a bit, but at the same time I drive a lot more laps here and it's also interesting to have new parts on the car and development, so I like them both."

"It was important for me to be driving the car as much as possible in this role because Davide Valsecchi and even Charles Pic last year didn't really do a lot. You can't further your career if you're not driving a car. You can be as good as you like at talking to the engineers but if you're not able to show what you can do you're no better off really.

"So that was really important for me. So far it's actually gone really well, every time I've been in the car the engineers are really happy, the team are happy so it's good for me that they're happy to put me in even more."