Site Data from an Excavation and Mitigation between Sizewell Gap and Sizewell Beach, Part 2 of Galloper Offshore Wind Farm Onshore Archaeological Works 2014-2016 dataset https://portal.medin.org.uk/portal/start.php?tpc=010_d2065578e962a106b0fa7ad7075b7e55 This collection comprises site data (reports, images, a CAD drawing, spreadsheets, databases, GIS data and site records) from the second phase of archaeological work associated with the development of a new onshore substation and related infrastructure for Galloper Offshore Wind Farm. Between 2011 and 2016, Wessex Archaeology carried out a programme of trial trenching, area excavation and watching briefs in association with the onshore elements of the Galloper Offshore Wind Farm development. The investigated area coincided with the footprint of the new onshore substation, located between Leiston and Sizewell, some 1 km from the Suffolk coast, as well as the cable route linking it to the landfall site on Sizewell beach. This part of the archive relates to fieldwork between 2014 and 2016 under project numbers 104810-104812. The works revealed little evidence for activity during earlier prehistoric periods, although a cluster of pits and other features seem to be indicative of Early Iron Age occupation. The principal findings of the investigations relate to the early and mid-Romano-British period, with an extensive system of conjoined enclosures and trackways periodically modified and abandoned after the mid-3rd century AD. 20190425