Lost my Scottish note virginity after 36 years!

As it says above I have had no problem spending my Scottish notes here in SE England where I have lived since 1988. Today in Costa it happened they refused my Scottish tenner. Bustards. What made it worse was the person in front of me said I should change to local currency if I visit another country... looking at her she wasn't born when I moved here. Full Scottish mode activated. Now I know, I know, I know that they have the right to refuse Scottish notes but it feels so personal, it's Anglo discrimination is what it is. Shame on you Costa. On a positive note the Co-op next door accepted my cash no problem less than 5 minutes later.