How did decolonization impact on Britain itself? And how did Britain manage its transition from colonial power to postcolonial nation? Sarah Stockwell explores this question principally via the history of the overseas engagements of key institutions that had acquired roles within Britain’s imperial system: the Universities of Oxford and Cambridge, the Bank of England, the Royal Mint, and the Royal Military Academy Sandhurst. Using a huge range of fresh archival sources, the author shows how these institutions fashioned new roles at the end of empire, reconfiguring their activities for a postcolonial world and deploying their expertise to deliver technical assistance essential for the development of institutions in new Commonwealth states. This study not only pioneers an entirely new approach to the history of the British end of the British empire, but also provides an equally novel cross-sectoral analysis of institution-building during decolonization and highlights the colonial roots of British postcolonial aid.