Flying Finnair, access to AA arrivals lounge Terminal 3 LHR?

Flying Finnair, access to AA arrivals lounge Terminal 3 LHR? Hi, I'm flying to LHR with Finnair, and as such I'm routing SIN-HEL-LHR. The final leg is a BA Club Europe flight on BA (AY codeshare). Technically this isn't a Long haul arrival into LHR, but does anyone know if I will be able to get into the AA arrivals lounge in Terminal 3? I have a conference I am heading straight to and would love to freshen up!

I don't think you will be able to access it...

Its only open to

AA Business and First Class + Exe Plat Card Holders (arriving on an AA Flight)

Long Haul First + Business from BA  + Oneworld Emerald (arriving on a Long Haul BA Flight)

First and Business Class + QF Plat Only (arriving on a Qantas Flight)

and 

First and Business + CX Gold and Plat Only (arriving on a Cathay Flight)

The list is quite odd and a Oneworld Emerald arriving on a Qantas flight does not get access but arriving on a BA flight does.

You can purchase a pass to access the lounge for ~AUD100.

Think henrus is correct. Access policy is pretty strict and from when I visited a few years ago they have a cheat sheet with specific flight numbers only allowed