If you are referring to the Rolls Royce factory near Goodwood race track in West Sussex (about 9 miles from where I live) Unfortunately they have a general policy of no public visits or factory tours. You could Include a visit to the Tangmere museum which is on the south coast near Chichester. Tangmere was a famous RAF airport during the 2nd world war where hundreds of missions were flown by Spitfires and Hurricanes to intercept bombing raids. the museum has a hanger attached housing many wartime aircraft, including Spitfires, which feature the famous Rolls Royce Merlin engines, you can walk round these airplanes. Tangmere is approximately 2 hrs drive from London and you would drive right past the Rolls Royce motor car factory.