MB was the only site being used by the general public in 2004. Plenty of space even if you arrived late Friday. We arrived Thursday night and it was nearly empty.
Contacted the ACO last week, to find out when tickets will go on sale, and was told
" we don't know , but soon"
Got good deal on ferry Dover/Calais, P&O, for that week, out Thursday, back Monday £60, that's with push bikes on top, Speedferries wanted £102.
Hope this helps.