Griffith was conscripted into the Royal Air Force during World War II. Before training in Canada, he returned to see his grandparents in Tenby, who, at his request, gave him an English translation of Hitler's book, "Mein Kampf" so he could better understand the origins of the war. He caught scarlet fever while on his training and was invalided out of the service in 1942, which resulted in his taking up stamp collecting. The first stamp he collected was the Siege of Ladysmith, South Africa.