Well, maybe it differs in parts of Scotland, and the statistics might have been wrong, but in West of Scotland (Greenock, Paisley and Glasgow) a bag of pakora with sauce was the typical things grabbed on the way home from the pub when I was growing up there 20 years ago. Chip shops themselves (and the commitment to the expensive equipment) have been dying out since the 80’s, possibly for health reasons. You are far more likely to find a kebab shop, with a small fryer, than the buckets of oil of a real chip shop. I think the nations taste has changed since the 80’s too, ethnic food does seem a lot more popular.
If it was type of food, then I’d actually believe if Chinese was listed, there’s far of those around my small home town, in the centre and in the districts. Maybe there’s two chip shops. There was an indian, but it went out of business.
Pizza isn’t as wide spread up there, as far as I can tell. Might have changed with the kebab/pizza/pakora/chips/fried chicken shops, but I’m not sure if there’s even a pizza hut in the 20 miles the house I grew up in, so the chains aren’t there…
And when it comes to actual food, the contents of a chip shop is various. But veggie pakora is likely sold there too. And in the doner kebab shop. And in the indian restaurants. Point being, a single one food is pakora, (vs a bag of chips, which I’ve only ever seen veggies order) and its a particular scottish favourite, you’ll struggle to find it far south of the border and they’ll pass off onion bhaji as it in the midlands…
And of course it does feature in a munchie box, something like deep fried mars bar, either only tried once, or for the tourist: Munchy box - Wikipedia
(Very hard to find the stastitics for the actual most popular scottish food, it’s the usual “how obese are the brits/scots” blame news articles which fill the google list).