Its a amazing weekend. Been a few times. My Sisters Ex was an MP in the Army, they were detailed as bodyguards for the celebs. One year he was looking after a very famous Motor Racing Commentator . . got to meet him, access to the drivers tents, etc. Chatted to some of the drivers . . it was ace.
The cars and hill climb are really good, as Marzman said the weekend is proper busy. Friday is a good day to go.
Hit up some of the locals for places to stay, there are some fabulous Country Pubs to stay in