The best selling point of the Castle is a large beer garden out the back and on summer days this is a great refreshment stop if you're walking up or down Primrose Hill. They have a decent selection of beers and ordinary but pricey food.
Thanks to the location the Castle is always full but they haven't put a great deal of effort in so it's just OK, except in summer when you can take a group of mates and turn a corner of the garden into your own drinking paradise.