Originally Posted by Tuvv

I'm sure this has been answered before but a quick search didn't find anything.
I'm flying LHR-ARN in a few days in basic economy.
If I have understood everything right I may use the first wing check-in, security and galleries first lounge as OWE? I guess priority boarding as well? Is there anything essential I missed, inflight perhaps?
I haven't flown BA in years and last time I did, I certainly wasn't OWE so I have zero experience.