djb, the circuit is just up the road from the house but it is still owned by the Earl of March who runs the estate. His father actually owns everything but isn't interested in motorsport, horses instead, so he looks after the horse racecourse and the Earl, who likes the motor racing, dreamed up the idea of re-opening the race circuit in '98 after it was closed in 1966 following a row over how it should be run, and the revival was born. When Lord March re-opened it again in '98 he drove round in a Bristol, exactly like his grandfather 50 years earlier.
The festival of speed is run up the house driveway and has been going for 8 years now. They also have current F1 and rally cars at the festival, whereas at the revival there is not a modern car in sight, not even the ambulances...very effective.
You can read more in the Goodwood circuit guide if you're interested, hope this helps
