Christian Horner claims he first expressed concern at Renault's turbo project back in 2012.The French manufacturer, which ironically first introduced turbo technology to F1 in the 1970s, has had a torrid season thus far under the new rules, with no tangible sign of improvement.With Lotus - which in a previous incarnation was the Renault F1 Team - said to be looking at agreeing a deal with Mercedes, Red Bull, which has won four successive titles with the French manufacturer, is demanding an improvement in reliability and performance.However, in the wake of a dreadful outing at his team's home circuit, Horner admits that his concern is nothing new, as he first expressed his doubts two years...
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