Pop iN
The only other Northern Irish bag I spotted in the book was Pop-In in Antrim. I don't think I've seen the bag before and I don't think I was ever in the shop, I'd very little reason to visit Antrim, but I have seen their price stickers on various sleeves. The stickers feature a nice cheesy tag "More Sounds For Less Pounds!" (see third pic)
Image Stephen Mcconville