Special thanks to friends and fellow researchers who have provided assistance and material during the writing of this book (in no particular order): Keith Chester, Peter Hassall, Joe McGonagle, Gary Anthony, Andy Roberts, Nick Redfern, Martin Shough, Nigel Watson, Ian Ridpath, Joel Carpenter, Paul Fuller, John Rackham, Martyn Johnson, Mark Pilkington, John Rimmer, John Keeling, Peter Brookesmith, Jenny Randles, Rob Irving and Alex Birch.
Archive material: Thanks to the Ministry of Defence and in particular Linda Unwin, The British Library (St Pancras and Newspaper Library, Colindale), The Churchill Archive (University of Cambridge), BBC Written Archive, University of Bristol (Professor Cecil Powell archive), The Broadlands Archive (University of Southampton); Imperial War Museum archives.
I wish to thank all my colleagues at Bloomsbury and The National Archives whose hospitality, patience and attention to detail are much appreciated.