I flew BA (well, GB Airways) from AGP a few years ago and there was definitely no oneworld lounge there, but we received invitations to a generic VIP lounge (which all airlines seemed to share) which was decent. I believe this was only for people in Business class, and by invitation only (no shiny cards accepted). Maybe there is an IB Lounge in the domestic/Schengen area, but we were in the International/non-Schengen section.