We have been on the 'annexe for years and are not aco members. No idea where the club bit is, its not on the map.
If you have not stayed on the annexe before, and assuming the club is part of it, it has numbered plots, flat, with a good amount of loos snd showers. Ground is ok for camping on, bit dusty but flat mostly.
Can be a bit noisy, but which site isn't?
Good access to the track and trams, also easy to get out for shopping etc.