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. Manufacturers should take action now to ensure compliance and consider applying for AEO status for benefits like fast customs clearance and recognition with trade partners.