Many of my ancestors came from the potteries, they must have had true broad pottery accents. I found this interesting link relating to it . I've seen examples of this before, and it can be hard to follow 
http://www.bbc.co.uk/stoke/content/articles/2005/08/10/words_messageboard_1_feature.shtml
http://www.bbc.co.uk/stoke/content/articles/2005/08/10/words_messageboard_1_feature.shtml