<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Darren:
I can't remember offhand, but I think the BA arrivals lounge is the same in London.</font>
Correct. The BA arrivals lounge is for BA/QF First/Business class passengers, plus BA Gold and Qantas top tier frequent fliers only.
Having said that, I did once manage to blag my way in on a CX Diamond in transit between a CX J arrival (in T3) and a BA Club Europe departure in T4.