com'on Mark & Jim, use the handy Mid-South map
http://www.oople.com/forums/showthread.php?t=10465
Think its £12 on the day, £8 prebooked (to late) watch out for the 2 speed cameras on the A43 just south of Silverstone, 70mph and difficult to spot untill too late...........
Come off the A43 to "Silverstone Village" first major left into road called West End, end of road turn right into Church Street, Sports centre is on the left, left into carpark and left again into field, drive round the edge to the bottom.