Mercedes have a major problem and have ditched the updates introduced to the W01 challenger last time out in Germany.

After Nico Rosberg finished on the Silverstone podium, the Brackley-based team brought further tweaks mainly to the blown diffuser and rear wing stalling system to Hockenheim. 

Both Rosberg and Michael Schumacher subsequently finished over a lap adrift at their home race.

"We have taken a step back," Schumacher told Auto Motor und Sport as the team revert back to the Silverstone specification W01 for the Hungarian race. "We will compete again with the full package at Spa."

Rosberg admitted to some frustration. "Every time we have a major update, something goes wrong," he said. "In Valencia it didn't work out, until we got it right at Silverstone. Hopefully for Spa the problem will be fixed completely."