In Biggles Sorts It Out, Mr Grey was the airport manager at Windhoek Airport. Biggles and Bertie called on him soon after arrival to inquire about Richard Browning. Grey tells he had seen Browning's Martin but it had only stayed a couple of days. Later, when the traffic superintendent reported that the Martin had not arrived at Cape Town, Grey speculated that Browning might have gone into the Kalahari Desert, where Browning had a business partner by the name of Mick Connor. He then proceeded to give Biggles a detailed and vivid description of Connor, his character and his activities. Later Grey also informed Bill Carter of the South West African Police about the arrival of Biggles and Bertie.