Reply To: Heathrow BA lounge access

[Swiss Jim]

The One World Lounge Access Policy is pretty clear on this.

Members of oneworld airline frequent flyer programmes with the equivalent of oneworld Emerald or Sapphire tier status can use lounges offered by oneworld airlines when departing on any flight marketed and operated by any oneworld member airline, regardless of cabin class being flown (exceptions are noted below).

Emerald tier frequent flyers can use First Class, Business Class or frequent flyer lounges.

Sapphire tier frequent flyers are welcome in Business Class* or frequent flyer lounges. (*does not include Qantas Domestic Business Lounges)

Emerald and Sapphire members may invite one guest to join them in the lounge. The guest must also be travelling on a flight operated and marketed by a oneworld carrier. You must be prepared to show your boarding pass and frequent flyer membership card, with oneworld Emerald or Sapphire tier status, to access a lounge.

So you need a boarding pass and a frequent flyer membership card with relevant status. You don’t need the the card number / status stated on the boarding card.