Thanks Dave
Well, that's the 2014 championship wrapped up according to that article:
But while Mercedes' rivals are aware of the championship leaders' secret, they are essentially powerless to react. The engines for 2014 are now in lock-down, with February 28 marking the agreed homologation date by which all the teams had to register their design for the new season with the governing body, the FIA.
"We're talking about 2014's double diffuser with the exception that you can't copy it this year," Hughes said during Sky F1's live coverage of the Bahrain GP.
"Its impact is maybe not quite as big as active-ride, but it's certainly a major technical advantage that they've engineered themselves for the rest of the season."