By Andrew Benson Motorsport editor at Silverstone

Schumacher seals easy win All the action as it happened Pictures from Silverstone

BMW Williams have admitted they have major problems to solve after their second consecutive uncompetitive race.

Juan Pablo Montoya, who finished fifth at the British Grand Prix, said: "The car is not quick enough."

And technical director Sam Michael added: "It was encouraging to get some points, but obviously we have a lot of work ahead of us to improve the car."

Williams are expected to replace stand-in Marc Gene with other test driver Antonio Pizzonia at the next race.

Gene is substituting for the injured Ralf Schumacher, who broke two vertebrae in a 200mph crash at the US Grand Prix last month.

Williams insist that no decision has yet been taken about who will partner Montoya at the German Grand Prix.

We need Ralf back in the car as soon as possible BMW motorsport director Mario Theissen

But Gene finished 12th at Silverstone after qualifying 11th, which was an even worse performance than at the previous race in France, when he started eighth and finished 10th.

And a team insider told BBC Sport at Silverstone that Gene's level of performance in France was "not something Williams can accept."

Michael said after Silverstone: "From where Marc was in the field it was difficult to make progress and although his ultimate lap time wasn't bad, it was not quick enough to make it into the points."

But the team also have doubts about Pizzonia's ability to deliver on a race weekend.

The Brazilian has proved very fast while performing testing duties for the team, but he was sacked by Jaguar after an unimpressive half-season as a race driver last year.

Schumacher is not expected to be back in action until at the earliest the Hungarian Grand Prix in five weeks' time.

His exact return date depends on whether his doctors allow him back into the car that soon, but BMW motorsport director Mario Theissen admitted: "We need Ralf back in the car as soon as possible."

Williams have had a bad run of races in recent weeks, and their last podium finish was at the San Marino Grand Prix in April.

They have been the victim of some unfortunate circumstances, and only missed out on a second place in Canada when they were disqualified for running illegal brake ducts.

But a major redesign of the car that was run for the first time in France last weekend has not proved to be the step forward expected.

Williams now face the prospect of lagging behind the improved McLaren team as well as BAR and Renault unless they can find some improvements at a test at the Spanish Jerez track next week.