I've found the scots curries are quite different from English ones, main difference being umpteen types of pakora available, spicier I think too scots seem to like the heat (I like it but can't eat it so have to be careful). Wider variety of rice dishes/accompaniments too. Just what I've noticed.
Ditto Chinese, slightly different menus, hotter curries, sweet n sour sauce on the spicier side, it's sweeter in England.
As I say I've also lived outside uk, dim of me but I didn't remember from first time living elsewhere in Europe as I was very young, but next couple times I was an adult and surprised to discover that in Indian, Chinese etc restaurants the menus and even dishes I thought I knew tasted different. Less heat but more flavour and much garlic (yum) I got talking to one restaurateur once and he explained to me that of course to get & keep the business they adapt to the palate of the country they're operating in (he'd worked in uk and Germany).
It was also interesting to note the different cuisines available as a result of different countries histories (in particular which other countries they'd colonised or traded with) so in Germany lots of Turkish and polish restaurants (veggie schoarma yum yum, good borscht and dumplings) in Netherlands Indonesian and Japanese food, and of course in uk Indian, Chinese, and if you're lucky in some parts of uk Kenyan, Nigerian, Egyptian and Jamaican food.
Ridiculous that it was only as part of that conversation I "got" that this was of course why USA more Mexican, Portuguese, Caribbean, Italian, Russian and French (via Canada) food, they don't have the same connections to Indian & Chinese cuisines.
Even seemingly familiar places like McDonald's have minor variations across the countries they serve.
Even at a really local level - guaranteed way to start a bun fight on my local Facebook pages is post
"What's the best Chinese takeaway in town?"
Seriously before it's even reached 10 posts it gets VERY heated! Partly local loyalties to certain parts of town, then the accusations of "snobs" and "neds" start flying around! Ends up with mods deleting - every bloody weekend!