What are your favourite UK snack items?

Maybe they didn't want people commenting suggestions of snacks from other countries. Aldi and Lidl are popular shops in our country. A lot of their products are dupes of branded products available in the UK, and generally they are making products catered to our culture and diet preferences. So, many of the products that Aldi/Lidl sell in the UK won't be available in other countries. I haven't been to a Aldi or Lidl in another country, but I bet many of the products you'd see on the shelves would be different to the UK. So I think it's valid to highlight something from Aldi/Lidl as a 'UK snack'.