International cooperation exists as the fundamental legal cornerstone of space exploration and has underpinned the United Kingdom’s role in outer space. Instigated by a surge of commercial activity in outer space, mankind is approaching a second space age whilst many of the world’s governments are captivated by increasing levels of nationalism. Focusing on the nationalism of the United Kingdom and corresponding ideology, this article purports that ‘Brexit’ poses a risk to the survival of the United Kingdom’s commercial space industry. As such, this article seeks to consider the ways in which this former great power can hone in on its history of integration and alliance in outer space and thrive in these burgeoning commercial space ventures.