1940 to 1945 - Royal Air Force Volunteer Reserve (prisoner-of-war from 1942 to 1945). Participated, as an earth-bearer, in one of the famous tunnel escapes; it is unclear whether this was the "Wooden Horse" escape, or the "Great" Escape[2]
Cyril Clarke answered an advert in an insect magazine for swallowtail butterflypupa that had been placed by Sheppard. They met and began working together in their common interest of lepidopterology. They also worked on Rh disease.
^Dictionary of Scientific Biography vol 17, supplement 2 pp 814–816
Sheppard P.M. 1958. Natural Selection and Heredity. London: Hutchinson. last ed 1975.
Dictionary of Scientific Biography vol 17, supplement 2 pp 814–816 by J.R.G. Turner.
Biographical Memoires of Fellows of the Royal Society 1977 vol 23 pp 465–500, plate, by Sir Cyril Clarke.
Obituary Professor Philip M. Sheppard, D Phil, FRS (1921-1976) by J.R.G. Turner. Journal of the Lepidopterists' Society vol 31, no.3, pp. 205–212 (1977) [includes list of publications]