From a British perspective, this is pretty clearly a faux-Scots interpretation for that earthy feel the author must have thought was warranted. Appropriated with all the confidence only the English can muster. I may be way off base, but those are first impressions.

> aither clear yersel' of this or stop yer living.

A few stereotypical Scots markers there. And "mony" and "mon" are Northern features from Derby to Scotland in various pockets. Dying out altogether now, of course, becoming the homogenised transatlantic factory line English we're all so excited to speak nowadays. Can I get a tea with milk to go? Cheers!