sorry I spotted this late - just to confirm both lounges are indeed open, and the one in the non-Schengen area (from which BA operates, though it also involves flights to plenty of Schengen destinations such as Italy and Greece!) is usually not too crowded these days and in my view quite pleasant.

The offering is entirely normal for NCE (except that what used to be served in containers such as salad and cured meat and cheese items are now in portion-size mixed plates for each type of item) though all served by staff and no self-service option.