[QUOTE=LH747FTL]
- Oneworld Emerald and AY Gold (Shouldn't make any difference if on AY or BA - I would raise hell if it does) [QUOTE]

Yeah, but the lounge is *not* operated by AY and is considered "third-party". See this thread where I describe my encounter with the lounge staff:
http://www.flyertalk.com/forum/showthread.php?t=530321

BA flights are eligible for lounge access *only* with BA Silver or Gold, *not* with e.g. AA PLT or EXP cards. If you're flying with BA and have OW Sapphire/Emerald from airline other than AY or BA, I'd recommend you take care of your lounging needs on the Schengen side.