This document serves as a resource base for information, dissemination activities, and publications delivered by The National HVDC Centre for Project Aquila and SSEN Transmission. It comprises the research and innovation work undertaken by the Centre over several years on the Aquila Interoperability Package, which has led to world first multi-vendor multi-terminal interoperability demonstrations, conference and journal publications, along with three accepted patents covering the multi-terminal control intellectual property developed by the Centre and SSEN Transmission. This document provides those new to Project Aquila with necessary information to get up to speed with its methodologies and approach to future multi-vendor DC grids.