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Reigning world champion Sebastian Vettel is anticipating a close scrap behind the Mercedes duo at this weekend's British Grand Prix.
Vettel was fifth quickest in the second practice session at Silverstone and is sure that Red Bull can improve.
"I think it was interesting today, obviously we’re not sure what the weather will do tomorrow and Sunday, but I think we learned a little bit today and will take that into the weekend," he said.
"Overall I think it was OK but we can still improve from where we are. Ferrari was pretty quick as well today, obviously the first row is taken, or seems to be, but behind that I think it was fairly close. It was quite windy which didn’t make life easy out there, so I think it was decent, but I want to improve."
Team-mate Daniel Ricciardo was fourth fastest and believes getting the Option tyres to work will be crucial.
"With the Prime, it was really good but with the Option we didn’t find enough time so, if we analyse tonight and get it right, then tomorrow we should be closer," he said.
"The wind here is always really strong and today in particular we had really strong gusts coming through and it changes a lot between the corners, you know one corner you feel like the car is really sharp and then another corner you feel like it doesn’t have any grip at all."
