Yes a good while ago I went, mate had a day out ticket with the MOD and invited me along.
They got the old cars out and they took us for a spin in them around a short circut.
First time I had seen what a Jag D-Type can do (well hot in the cotpit, all Ally body so heats up too much, the drive had to keep stopping to cool down as the car got so hot).

Go it would be cool.