North was one of seventeen shortlisted entrants invited to submit a full submission to the Institute of Economic Affairs's 2013 Brexit Prize competition. Entrants were asked to imagine an "out" vote in a proposed referendum on United Kingdom membership of the European Union and asked to compose a blueprint for the process of withdrawal, taking account of Britain's relationship to global governance and trade systems. His proposal reached the shortlist for the final. It became the official policy of Arron Banks' Leave.EU campaign that vied unsuccessfully for official recognition as the official Leave campaign.