The official record is 487, but only includes basic types. For example Captain Brown flew fourteen (14) versions of the Spitfire and Seafire and although these versions are very different they only appear once in the list. The list only includes aircraft flown by Brown as ‘Captain in Command’.
He flew British, American, German, Italian, and Japanese aircraft, including Heinrich Himmler’s personal plane. He was one of two survivors from 802 Squadron to survive the sinking of the HMS Audacity. He signed a waiver for the crew before flying the hypergolic-fueled Messerschmitt Me 163, saying they had acted on his orders. He cheated death again, surviving high-g pitch oscillation in the de Havilland DH-108. He was fluent in German and interviewed a number of captured Germans, including Wernher von Braun. And a thousand other fascinating stories.
He’s 94 now, retired to his native Scotland, writing more memoirs and sharing oral history of his 31 years in the Royal Navy. He wrote his autobiography, Wings on My Sleeve in 1961 and has kept updating the subsequent editions. I think I’m going to have to buy that.