It does depend where you are. I've virtually never had trouble in the North of England, even quite a long way north (in fact, I can only think of one exception, and I got the strong impression that the bloke in question just wanted to be difficult). It's usually fine in Oxford and London, too.
The other fun thing about Scottish bank note design is that three banks are allowed to issue notes. The colour scheme and size is consistent, but you get different designs. I'm particularly fond of the current Royal Bank of Scotland series, which has a notable Scottish woman on the front, a quotation from a Scottish poet, and an animal design on the back - the £10 has astronomer, mathematician, and advocate for women's rights Mary Somerville, and the back has some cute otters.
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The other fun thing about Scottish bank note design is that three banks are allowed to issue notes. The colour scheme and size is consistent, but you get different designs. I'm particularly fond of the current Royal Bank of Scotland series, which has a notable Scottish woman on the front, a quotation from a Scottish poet, and an animal design on the back - the £10 has astronomer, mathematician, and advocate for women's rights Mary Somerville, and the back has some cute otters.
https://en.wikipedia.org/wiki/Banknotes_of_Scotland