Rex`s House + Long Road ?

I just watched the "Visions" travel DVD of England, which is all shot from a helecopter, and there is a large Manor House called Longleat House that is shown in there, with a very long road leading up to the front of the house and the ample car park area too. I could swear that this is the house where all those old Rolls` of different colors disembark for the races that day in the film. Very impressive with all those beautiful autos. Filming locations does`nt help.