Aero bars! I'd forgotten about those, thanks for that... Yeah, the texture is a bit strange at first, you sort of wonder if it's a scam to sell a lesser amount of chocolate for the same price as a solid chocolate bar, but they grow on you. I was a fan of the mint Aeros. Also similar: Cadbury Flake. Didn't Milka make a chocolate with bubbles as well?

Yes, clearly all I learned in the UK is the hierarchy of chocolate bars. Now, if you can get flavored Kit Kats (cappuccino! orange! mint!) in Bulgaria, you'll be all set.. ;)