Katherine Hepburn! Wow! Well, I love her, but think she sounds like no one on earth, actually. (To be more accurate, the accent is not that dissimilar, but I'd say her vowels are broader than mine.)

And Canadians are famous for saying "aboot" rather than "abowt", and have a bit of that "uh" sound in their vowels, so I guess they come closer to a Scottish accent than other North Americans.