In Copernican Revolution, Gabriel Elefteriu explains why the UK must exit EU’s Copernicus Programme and how to use the freed-up money to turbocharge Britain’s space enterprise instead. The 60-page report lays out a comprehensive and costed “Plan B” policy package with four key pillars: two Earth Observation-focused programmes (a dual-use domestic one, and one via ESA); a National Space Lab to cohere all of Britain’s space R&D activities and support delivery; and a major increase in UK’s contribution to ESA, subject to specific guarantees being obtained by the British Government. The paper also calls for true civil-military space integration (including through joint funding of Plan B), a radical reform of UK space governance, and outlines a vision for Britain as a leading space nation in the 21st century.