Britain is facing big security challenges in the 2020s. The decade to come will not be as favourable as the two past decades. For a country as 'globalised' as Britain, security challenges cover a wide spectrum - from terrorism, international crime and cyber attack through to the prospects of war in its own continent or even, again, for its own survival. Brexit has entered these equations and turned them into a political tipping point, from which there is no hiding and no turning back. Tipping Point looks at the immediate and long-term security challenges Britain faces - from security and foreign policy to the crisis of liberal democracy - as well as Britain's security capabilities. Clarke and Ramscar provide a strong grounding on which to understand Britain's security futures and also to understand the challenges that face Britain well beyond Brexit. Looking at both the national and the global as well as the historical and the emergent, this book is written for both the scholar and the lay reader to inform and suggest the challenges that Britain faces and what it takes to find vigor in the face of them.