Originally Posted by
kdm97
Yes, you'll get access to the lounge as a Gold on a BA ticket, even though it's not BA metal

But note that you would not get lounge access on your way back to the UK, even if you are booked on a BA codeshare flight number through the BA website/app.
Lounge access in this scenario is only granted by virtue of it being a BA operated lounge. So unless flying from an airport that happens to have a BA lounge in the "right" terminal (e.g. at FCO) you do not get lounge access.
This privilege also only applies to Gold member; Silvers and below don't qualify, not sure about OWEs.