I am extremely grateful to all those who supported me in the writing of this Whitehall Paper. Malcolm Chalmers was exceptionally generous with his time and expertise. He offered extensive guidance from start to finish, and carefully read several drafts of the manuscript. Andrea Berger and Hugh Chalmers were similarly helpful, and I could not have done without their frequent advice, particularly on a great number of technical issues. The paper benefited from the patient and expert editing of Adrian Johnson, with Ashlee Godwin. Saqeb Mueen and Daniel Sherman have been unfailingly supportive colleagues.
Many other individuals provided feedback, whether in writing or in conversation. Some of these would wish to remain anonymous, but I particularly want to thank Ali Ansari, Nick Beadle, Julian Borger, Jonathan Eyal, Peter Jenkins, Frank O'Donnell, Andreas Persbo, Ian Stewart, Sir Harold Walker, and Heather Williams. I am grateful to others who commented on drafts at two workshops held at RUSI in June and August 2012. Finally, my greatest debt of gratitude is to Hannah Cheetham, Sundanda Joshi and Vinit Joshi.
Any remaining errors or shortcomings are, of course, mine alone.