I am an ACO member, and have been since 1996, but my Volvo breakdown was not covered by that membership. For some reason, the ACO decided to discontinue roadside recovery from the formula. Only if you have continuous membership since it was cancelled (not sure when) will they still cover you.
For some reason when I renewed last year, they gave me a 'new' membership number and that lost me my roadside recovery.
Watch out!!