Over the last 20 years interpretive approaches within Iron Age studies in Britain have moved from the national to the regional. This was an important development which challenged the notion that a unified, British, Iron Age ever existed. However, whilst this approach has allowed regional histories to be told in their own right, there has been far too much focus on ‘key’ areas such as Wessex and Yorkshire. Our knowledge of the ‘gaps’ in-between these regions is uneven across the country and seriously distorts our understanding of the period. This situation is particularly acute in Wales where there is a paucity of very large material and structural assemblages. As with many ‘in-between’ areas, developer-funded archaeology has increased the baseline dataset, although the interpretations of those data have not developed in parallel. This paper will demonstrate that, to more fully understand the integrated regional composition of Iron Age Britain, we must give detailed consideration to the evidence from these ‘gaps’. By bringing together for the first time all of the available aerial photographic, chronological, faunal, palaeobotanical, and excavated data in one of these ‘gap’ areas, southern Glamorgan, this paper will show that through the careful analysis of the available evidence we are able to gain an understanding of different areas’ distinctive regional characters and move beyond our over-reliance on a small number of key regions.