Michael Schumacher has admitted that he and Mercedes have to face up to their problems in order to turn their season around.
"We have to face the fact that we were less competitive in Valencia than we had hoped for which makes it difficult to predict how we can perform at the British Grand Prix. Our race pace has been quite promising but our qualifying speed is not yet ideal and we still do not understand the full picture about the tyres. This clearly is something that we will keep working on intensively."
Mercedes Valencia upgrade included a blown diffuser, similar to the one used to devastating effect on the Red Bull so far this season, and team principal Ross Brawn believes it will start to show its true effect on the car's performance over the coming races.
"Our team has had a challenging time over the recent race weekends in Montreal and Valencia but we retain our motivation and are working hard to improve our performance and maximise the potential which can be taken from our latest upgrades. It's a long hard road ahead but we are confident that we will get there."