As McLaren prepares for the British Grand Prix here this weekend, home heroes Lewis Hamilton and Jenson Button are hoping upgraded cars will give them the edge over the high-flying Red Bulls.

Although many teams introduced upgrades ahead of the European Grand Prix, German Sebastian Vettel proved the Red Bull car was still the fastest by cruising to victory on the Valencia street circuit.

Defending drivers' champion Button is worried his team might be playing catch-up.

The 30-year-old Briton said it is crucial for his team to get the most out of its updates if it is to challenge its rivals but is unsure if it will have enough testing time.

"Other teams have been working on their update kits and they are a race ahead of us." said Button, "They came out very strong, but I still think we did a very good job in Valencia to get two cars on the podium.

"Here we do need to raise our game. We do need to add performance to the car if we are going to challenge the Red Bulls and a couple of other teams.

"Putting these new parts on the car is not just going to be putting them on and going fast, we have to work with the new balance of the car and what the updates give us - but it is a challenge.

"The updates are very important for the rest of our season. They don't always work when you first put them on the car. As we saw with a couple of teams in Valencia who had an update package, you need to work on it."

Fellow Briton Hamilton, 25, also has his reservations about the upgrades but insisted he would be doing everything he could to get the car performing to its maximum.

"We have to make sure we make these components work this weekend," said Hamilton. "We haven't had time to test them really so there has to be some adjustments made to the car - and how we have to drive it to get the optimum.

"We are looking forward to it. We don't know how much the package will deliver; it doesn't always bring what you expect - so we have to see which parts work and which parts don't."

Former world champion Briton Damon Hill, who took the title in 1996, this week suggested the calm relationship between British heroes Button and Hamilton is unlikely to survive the year.

"It's just on simmer at the moment. Soon, it's going to start to boil over. This could be the start of the rest of the season," he said.

Button was quick to reply and insisted the two drivers had a very good understanding.

"We are both very competitive and we both want to win but as we keep saying, first of all you have to work together.

"You have to work closely to improve the car and I think we've done a very good job this year of pushing each other very hard, not just on the circuit, but also off the circuit in developing the car and the set-up.

"So for me it is a good relationship. I am sure it is going to continue."