Bernie Ecclestone has warned there is 'trouble ahead' for manufacturers if they don't relent on the current specification of engines after he lost his bid to introduce an independent alternative.

The F1 supremo has been a staunch critic of the current V6 Hybrid formula since its introduction in 2014, which he feels doesn't deliver enough of a spectacle and have become too complicated for viewers to relate to.

Though he found an ally in FIA President Jean Todt towards the end of 2015 - who complained the engines were too expensive for customers -, the recent promise by manufacturers to reduce costs has seemingly satisfied him enough to agree they remain until 2020.

Indeed, Ecclestone had seemingly clawed back power from Mercedes and Ferrari - the two dominant engine suppliers in F1 at the moment - by pushing on with a proposal to introduce a cheaper independent engine supplier, but he now lacks the support he needs to make it happen.

Saying nothing can change as long as Mercedes and Ferrari retain an 'alliance' that ensures they maintain their competitive advantage, while he admits he wouldn't expect them to give up their position of influence, he has warned they must

"Until we get an engine that can be built at a lot less cost, yes, there will be trouble ahead," he told the BBC. "Frankly, if I was either of them, I would be in the same position," he said.

"If we have a meeting of the F1 Commission and these two guys decide on something, which they do together, they have enough votes to stop anything going through, so they are controlling F1."