First and foremost I must thank Bob Berry, who was a detective sergeant with Scotland Yard’s Murder Squad during the 1960s, for his friendship and invaluable assistance. Without his input and guidance during those heady, crazy days of the Swinging Sixties, this book would have been impossible.
More recently, I was given immense help by staff of the British Museum in London. Their kindness, diligence and willingness to help at all times with good humour were much appreciated.
Finally, but of course not least, I owe a debt of great gratitude to my editor at John Blake Publishing, the incomparable Toby Buchan. His patience, understanding and calming influence, as always, have made it a joy to write for him.