Fill our bellies we did. We proceeded to order too much chicken, too many sides and a nacho starter that we clearly did not need. Add a jam jar for myself, of soda, fresh mint and lime with a (large) shot of gin added at the table and I could have rolled out of the place.
Our chicken was mainly in the form of wings. Soy & traditional buffalo. 2 buckets. Patatas Bravas seemed to be a bit of a random side dish on the menu, but as I love them, they were ordered. The buffalo wings were almost as tasty as any I have tried outside of America (the Hudson Bar still wins on this - theirs are GOOD). The soy were less my thing but the kids loved them after they had cooled down enough to handle.
Given the area most of the staff were most likely students and given the style of the place I wouldn't expect much more from the servers than a fair amount of efficiently and a bit of banter. On this, they delivered, and all seemed to be getting into the spirit of things in their fancy dress.
Birdcage is a great option for a relaxed dining experience in pleasant surroundings. With the outdoor area, I'm sure you could do a lot worse on a summer's day than sitting outside here with a bucket of chicken wings and a jam jar full of gin & juice. Only about 6 months to go until I can give that a try...