You're not correct. There are accents strong enough in both SC and the UK to befuddle the other. Heck, even within SC it'd be hard for some northern transplant

You're not correct. There are accents strong enough in both SC and the UK to befuddle the other. Heck, even within SC it'd be hard for some northern transplants to understand rural drawls, and within the UK it's not unknown for Londoners to wonder at Glaswegians (https://www.youtube.com/watch?v=91Tj7eezFJ8 https://www.youtube.com/watch?v=91Tj7eezFJ8).