It was late in the evening on 22 August 1961, and Michael John Gregsten, 36, and his mistress, Valerie Storie, 22, were sat in his car in a cornfield at Dorney Reach, Buckinghamshire. As the couple chatted, a man tapped on the driver’s door. When Michael wound it down, a gun was thrust in his face. ‘This is a hold-up, I am a desperate man, I have been on the run for four months. If you do as I tell you, you will be all right,’ a cockney accent said.