I think you might find that it is a broad Lancashire accent as Corrie is set Greater Lancashire formerly part of Lancashire.Not a mistake you want to make up here considering the long-standing Yorkshire/Lancashire rivalry.
Well I am from the South and I need Teletext when she speaks !! The others on Corrie don't speak with such strong accents and are understandable. Also can Clare Peacock please not tuck her hair into that Hat? She looks like Nora Batty.