James Milroy & Lesley Milroy 
Real English [EPUB ebook] 
The Grammar of English Dialects in the British Isles

While it is accepted that the pronunciation of English shows wide regional differences, there is a marked tendency to under-estimate the extent of the variation in grammar that exists within the British Isles today. In addressing this problem,
Real English brings together the work of a number of experts on the subject to provide a pioneer volume in the field of the grammar of spoken English.