Jul.14 (GMM) Team boss and F1 veteran Sir Frank Williams has expressed doubt about the switch of hosts for the British grand prix in 2010 and beyond.

F1 chief executive Bernie Ecclestone, and FIA president Max Mosley, have confirmed that Donington Park is to take over from historic Silverstone, the permanent venue of the event since 1987.

Some observers, however, wonder not only how Donington will find the time to upgrade the rudimentary venue, but the necessary $200 million, not to mention local planning permission.

"When I'm at Donington in 2010, if I'm really there I'll believe it, but I'm not certain," Williams told his team's official podcast.

Williams believes two years is enough time to get the track ready, but wonders about the immense expense of overhauling Donington, last the scene of a grand prix in 1993.

He said: "I don't know much about Silverstone's affairs but I would guess (Donington) is a much more expensive project than the one Silverstone are required to do if they wish to retain the grand prix.

"I will just find out in course where we are supposed to be," Williams added.