The central idea of this chapter is koineisation, the process by which discrete varieties tend to form into a new compromise variety when speakers of these varieties find themelves living side by side. Dialect levelling and new dialect formation are central forces in the process. The case study considers what happens when closely related but discrete language varieties come together in new circumstances. Primary focus is given to contact between Scandinavian varieties and Low German in the late medieval and early modern periods and between Old English and Viking Norse in northern England in the early medieval period.

This chapter presents an up-to-date overview of what we know about contemporary grammatical variation in England, drawing on a range of sources such as traditional and variationist dialectological investigations, as well as those using new technologies such as smartphone apps and Twitter feeds. It begins with an assessment of how common the use of non-standard morphosyntax is vis à vis Standard English, before presenting a well-cited list of the most widespread features that are claimed to be found right across the country. The chapter then describes contemporary non-standard grammatical variation in England, examining, in turn: verbs, negation, adverbs, prepositions, plural marking, pronouns, comparison forms, articles and conjunctions. Beyond an account of contemporary morphosyntactic variability, this survey also helps us to locate those linguistic features and those geographical areas about which we hold very little up-to-date information, and, in the light of reports of widespread traditional dialect levelling, points to those non-standard features whose vitality appears to be precarious.

The chapter deals with segmental and suprasegmental features of English spoken by residents of England without a recent migration history – though two major new varieties, British Asian English and Multicultural London English, are briefly discussed. While the emphasis is on the period since the turn of the twenty-first century, the chapter also deals with changes since the 1960s. The chapter begins with a presentation of recent technological advances, such as magnetic resonance imaging and innovative quantitative cartographic techniques. This is followed by a discussion of consonants, vowels, rhythm, stress, intonation and voice quality. The chapter goes on to show how some features are involved in levelling at the national or regional level, while other local and regional features are maintained. Using older dialectological sources as well as contemporary sociolinguistic methods, four regions are discussed, those centred on London, Newcastle, Liverpool and Manchester. The evidence shows similarities (a general reduction in variation) and differences (maintenance of differences between neighbouring cities). Levelling in the South East involves a shift of vowels towards Received Pronunciation-like variants, while consonants do not take part in this change; the exception is the rapid loss of traditional h-dropping. Finally, the influence of standardisation is discussed.