This work examines both the UK and international regulation, as well as the case law and legislation affecting a wide spectrum of modern financial techniques. Within the scope of those financial techniques are the broad range of instruments, structures and contracts deployed by global financial markets in relation to corporate customers, sovereign entities and other public sector bodies. The essays in this collection are concerned with the nature of the modernity of financial products like derivatives, and the particularly acute challenge that they pose both to the control of financial markets by private law and by established means of regulation.