From Wednesday, BAR, Toyota and Ferrari are slated to attend both three-day events in preparation for the upcoming double F1 header in North America.
Renault, McLaren, Red Bull and Williams will run at Silverstone, while Sauber pursue their efforts at Monza.
Curiously, it is reported that Tonio Liuzzi's scheduled Wednesday (Silverstone) run for Red Bull was put back to Friday because the Italian was expecting delivery of a new bed (!).
"We'll be testing at Silverstone and Monza," said BAR's Jenson Button, baffled about the Honda powered car's lack of speed at the Nurburgring.
"We're going to test the new bits and the old bits ... because we shouldn't be that slow." -GMM