McKee was educated mostly by a series of governesses, from whom he acquired an acute eye for the quality of evidence. However, his lack of paper qualifications was to prove a serious hindrance to his later career. The most unusual thing he did in his youth was to fly solo at the age of fifteen. In the Second World War, McKee served in the British Army and wrote war poetry. After the War he served with the British Army on the Rhine. He wrote articles for the BAOR newspaper Polar Bear News and became a writer and producer for the British Forces Network in Germany. After demobilization, McKee became the editor of Conveyor magazine and wrote plays for BBC radio. Among many other subjects, his plays covered Trotsky's assassination, Dr Semmelweiss's campaign to get modern standards of hygiene adopted in hospitals across Europe, and the "mad" monk Rasputin odd story and seemingly hypnotic influence on the Russian Imperial Family. Next, McKee decided to concentrate on documentary authorship, publishing some 27 books during his life. In between researching and writing books, McKee took up sub-aqua diving with the Southsea Branch of the British Sub-Aqua Club. His projects got the branch voted the most interesting in the United Kingdom three years running. Next, he drove forward the discussed but unactioned project to search for King Henry VIII flagship Mary Rose. He proposed an official search for the Mary Rose to the National Maritime Museum at Greenwich, but his proposal was humiliatingly rejected, perhaps owing to his lack of formal qualifications. He had no other option except to pay the Crown Estate Commissioners to rent the Mary Rose wreck site and thereby afford it protection from wanton pillage. Soon, from about 1965 onwards, he was concentrating most of his efforts on the Mary Rose project. Preserving a Tudor "mud" ship for posterity cost him more than time and effort; his earnings plummeted, and he was compelled to move to a smaller house, to the dismay of his long-suffering wife and older children. Later, as age and ill health took their inevitable toll, McKee was side-lined from the project he had nurtured for over a decade. However, for finding the Mary Rose, he was appointed an Officer of the Order of the British Empire. McKee published King Henry VIII's Mary Rose in 1973. It was the first book about the Mary Rose project by nearly a decade, so it could be regarded as a seminal work. His vision already detailed most of what later became reality, even to the opening of the new Mary Rose Museum, and much of what he wrote is reiterated in publications by later authors. However, King Henry VIII's Mary Rose is seldom referenced. In contrast, McKee's more frequently referenced book How We Found the Mary Rose was published as late as 1982, nearly a decade later. Although a human interest work, it includes many excerpts from the diving logs of his original diving teams from Project Solent Ships and MRSB0551: hence the "We" in the book title. He targeted these two books specifically on the Mary Rose. He also provides summaries of his Mary Rose research in some of his other books. With the unveiling of the new Mary Rose Museum in Portsmouth's Historic Dockyard in June 2013, retired journalist Henry Yelf noted that no mention was made of McKee in the British national press. This was despite the fact that most agree that without his pioneering work the wreck would still be under the mud. McKee and his team of amateur divers had located the wreck, after extensive searching, by plunging long steel rods into the soft mud until they struck timber. Until then sceptics had described it as "McKee's Ghost Ship". Yelf launched a fundraising campaign which resulted in a bust of McKee being unveiled in the museum few months later. A copy of the bust can be seen in Hayling Island library, close to where he lived.
