Mike Sadler is one of a handful of surviving original SAS men. Major Sadler, 93, was the navigator for the regiment’s founder David Stirling, guiding raiding columns for hundreds of miles behind enemy lines in North Africa.;Twitter Instagram Facebook Dan Snow;Producer: Dan Morelle;Part 1 of Dan Snow's new 3-part series, Operation Gold Rush is available to stream on iPlayer now and continues this Sunday on BBC Two at 9pm.