I think that Silverstone wanted the biggest possible gap between their rounds so the track had time to recover.
I may do the rescheduled round now as we were enjoying our first running on the new track at Swindon on Sunday. Although I know some of our members made it to Silverstone to find out it was cancelled.
Ref the Swindon track, someone at the clubs been trying to do some panoramic shots:
http://www.postimage.org/image.php?v=aVTkWDA