I have taken some British money with me as an emergency back up in case my Polish zloty was getting low. Looking at the exchange rates for GBP at the Kantors in ul. Florianska, they are hovering around 4.5 to 4.6 zl to the pound, GREAT, better than back home.
Not so great. Why? Two places only offered 3zl to the pound because the notes were from a Scottish bank. Another refused to deal with them. When I asked why, the person pointed to the Union Jack and said calmly, "We only deal with this money." GRRRRR!
Perhaps they should change the Union Jack emblem in the display to the flag of St. George?
I eventually found a place in the Main Square which accepted my notes at just over 4zl to the pound, but the person told me they have a problem with Scottish notes. She wouldn't say what the problem is.
Oh, if your thinking about changing your Scottish notes to English notes, make sure the notes you receive are new. I had an 'old' Bank of England 20 pound amongst my Scottish money and they refused to exchange it because it was 'old' It wasn't damaged or torn in any way so I don't know what was 'old' about it.