Sebastian Vettel returned to Silverstone for Wednesday's test Getty Images Enlarge Sebastian Vettel has suggested Red Bull's current rate of development is not at the level it needs to be if the team is to enter 2015 on an even keel with Mercedes. Red Bull still appears to be a way off catching Mercedes this year, with the Renault power unit limiting its competitiveness at the recent flurry of power-hungry circuits. When asked whether he believes Red Bull can be on a level par with Mercedes in 2015, Vettel said: "It's difficult to say, right now the gap is very big and we didn't really close the gap since race one, obviously we have tried lots of things to improve but they do the...
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