After c. 400 BC Britain appears to become more remote from Continental development. During the Middle Iron Age period (400/300-100 BC) regional styles of pottery continued to evolve, reﬂecting much the same territorial divides which had become established as early as the sixth century. Standing back from the palimpsest of localized style-zones, it is possible to distinguish four broad divisions (Figure 5.11): a south-west region, extending into Somerset and south Wales and characterized by a free curvilinear style of ceramic ornament which has much in common with Armorica; a central southern region stretching from Sussex west across Wessex into the Cotswolds and Welsh Marches, typiﬁed by straight-sided saucepan pots; a Midland region, extending from the Thames valley to the Trent, characterized by hemispherical bowls; and an eastern region, essentially coastal in distribution, from East Sussex to Lincolnshire where the predominant form was the highly decorated jar. These broad regional divisions are also reﬂected in the type of settlement pattern which had emerged, a fact which suggests that the pottery styles might provide an insight into real socio-economic groupings. It will be argued later (chapter 21) that in the distinctive style-zones which begin to crystallize in the sixth century BC we may be seeing incipient tribal groupings. Once established these entities are maintained throughout the Middle Iron Age with little change. The broader regional groupings which it is possible to discern by the third century may indicate tribal confederacies: at the very least they present a generalized picture of regional contact and contrast.