He says: 'The two major technologies - the F-duct and the blown diffuser - we are still not completely there with.

BBC: Hungarian GP as it happened

Mercedes had arrived at their home race in Hockenheim with a modification to their exhaust blown diffuser and a new rear wing.

BBC: F1 test ban ridiculous - Michael Schumacher

His driving style was not suited to the off-throttle blown diffuser, which Vettel used to such devastating effect en route to 11 wins in a truly dominant season.

CNN: Mark Webber: F1's elder statesman remains outsider