This document provides guidance for manufacturers on preparing their supply chains for Brexit. It recommends immediate steps like registering with HMRC as an importer/exporter and applying for customs accounts. It also suggests longer term steps such as reviewing contracts, customs procedures, and supply chains to identify potential cost increases and mitigate these through duty reliefs and simplifications. The document promotes applying for AEO status which offers benefits like fast customs clearance and recognition with trade partners. BDO specialists are listed who can assist manufacturers with Brexit supply chain implications.