The Schengen boundary cuts off Gates B20 to 28(?). This is where BA and easyJet board from.

The Lounge is in the common part of the building after security and the duty free shop. Once you go through passport control into the non-Schengen Gates used by BA/EZY then you have a Pret a Manger, newsagent and souvenir shop, so dont rush to go through the passport control into this zone if you have a lot of time on your hands. On the plus side there is loads of seating there as not too many non-Schengen departures.