Milligan was born in Ahmednagar, India, on 16 April 1918, the son of an Irish-born father, Captain Leo Alphonso Milligan, MSM, RA, who was serving in the British Indian Army. His mother, Florence Mary Winifred Kettleband, was born in England. He spent his childhood in Poona (India) and later in Rangoon (Yangon), capital of Burma (Myanmar). He was educated at the Convent of Jesus and Mary, Poona, and St Paul's Christian Brothers, de la Salle, Rangoon.
He lived most of his life in England and served in the British Army, in the Royal Artillery during World War II.
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