Christian Horner claims Renault behind as they 'started too late' on turbo engine
Rivals Mercedes have dominated start to F1's new era
Friday 16 May 2014 16:50, UK
Red Bull boss Christian Horner believes Renault, the World Champions' engine suppliers, have been left behind at the start of F1's new era by Mercedes as they "started too late" with the development of their turbocharged power unit.
