Grammatical variation in British English dialects : a study in corpus based dialectometry Variation within the English language is a vast research area of which dialectology the study of geographic variation is a significant part. This book explores grammatical differences between British English dialects drawing on authentic speech data collected in over thirty counties. In doing so it presents a new approach known as corpus based dialectometry which focuses on the joint quantitative measurement of dozens of grammatical features to gauge regional differences. These features include for example multiple negation (e.g. dont you make no damn mistake) non standard verbals (e.g. so I says What have you to do) or non standard weak past tense and past participle forms (e.g. they knowed all about these things). Utilizing state of the art dialectometrical analysis and visualization techniques the book is original both in terms of its fundamental research question (What are the large scale patterns of grammatical variability in British English dialects) as well as in terms of its methodology