I've been to this event many times usually driving my Vitesse or TR4a. I can endorse the other comments - it's is a great weekend. I recently came apon a tremendous collection of photographs of old Angouleme including some of racing there in the 40s and 50s, have a look on
http://www.christian-claude.com
What is remarkable is how little has changed, the cars and the circuit are the same, just Arnco replacing straw bales.
I shall be going this year.
Andy