Asiana Club - LHR T1 Lounge Access for Asiana Flights

My in-laws are flying from LHR-ICN next month and they asked me what lounge access they can expect in T1. They're flying J with a redemption ticket.

Can anyone offer any advice to which lounge they should use to experience the best T1 has to offer? I know about the *A lounge but wondered if they'd get in to the new BMI lounge on a J ticket?

Thanks

Yes, they can according to this post (http://www.flyertalk.com/forum/12184229-post12.html) in the BD forum.

Great, I presume "bmi Number One Heathrow" is the lounge to aim for?

Correct, No. 1 is the new BMI lounge, very nice. If they have time they can check out both lounges and compare. On the way back they will have access to the nice OZ C Lounge at ICN.