Red Bull Racing's Christian Horner says Daniel Ricciardo would be granted an A+ on his 'half-term report card' as a reward for his efforts to bring the relatively uncompetitive RB11 up to speed.

Having elevated Ricciardo to team leader status in Red Bull in the wake of Sebastian Vettel's exit, Horner feels he has assumed the greater responsibility with aplomb and his unfailing efforts during the first-half of the season deserve lofty praise.

"I think Ricciardo's half term report is A+ to be honest with you," he said. "You can always improve in some areas, of course you can. But he's at the top of his game and some of his overtaking moves today were back of the best that we've seen of him."

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Horner was also praiseworthy of Daniil Kvyat's upward trajectory over the course of the year, not least because is second place finish in Hungary - though somewhat fortuitous- represents Red Bull's best finish of 2015.

"I think really since Monaco he's just making more and more progress," he said. "I think he did a really good job in Hungary and he deserves his first podium. I think that's another tick in the box for him and he'll draw confidence from that. It's part of an upward trajectory for him, he's developing very nicely.

"The one thing he needs to do is pay more attention to the rule book but he's getting there. After a slow-ish start which wasn't really all his fault; he missed the first grand prix, lots of reliability issues and failures.

"It could have got into his head a lot more than it did and testimony to him that he bounced back from it and got himself going. I'd say a very positive report for him going into the first