American linguaphile with Scots roots and a particular fondness for all shades of accented English here. I've had some trouble understanding some Manc, Liverpudlian and even Appalachian speakers, especially when you throw regional slang and proper nouns in to the mix. Have covered maybe a good third of Britain, including Edinburgh and points west of Scotland, and the only time I've been completely flummoxed was in a friendly group chat on the street in Edinburgh and one older gent from Glasgow was so utterly incomprehensible to me it became a running joke. I finally asked someone else if he was in fact speaking English, and the answer was, "No; Scottish!" And we all had a good laugh. No, really.