BA lounge access for partner airline connection

[Colin84]

I booked Dublin to Cancun as reward flights with a 2-4-1 voucher. Dublin-Gatwick legs were with Aer Lingus and Gatwick-Cancun BA in Club World. However, when I tried to access the BA lounge in Gatwick while waiting for my return Aer Lingus flight to Dublin, I was denied access to the lounge and informed that I could only access the lounge if this connecting flight to Dublin was with BA. Does this sound right? I can’t see anything in the one world terms to this effect. In any case, it seems a pretty unreasonable exclusion.

[BA Flyer IHG Stayer]

EI isn’t a member of One World so the usual OW rules don’t apply.

You can access the BA lounge at LGW when flying EI in certain circumstances as per

https://www.headforpoints.com/2020/02/18/use-lingus-lounges-with-british-airways-gold-silver-card-status/#:~:text=In%20Gatwick%20or%20Belfast%3A&text=Aer%20Lingus%20has%20no%20lounges,a%20British%20Airways%20flight%20number.

[Colin84]

Fair enough, I just assumed Aer Lingus was a member. Thanks for replying.