John Morris was born in
Wimbledon on 18 February 1910, to Humphrey William Morris and Jessie Muriel, daughter of Henry Vercoe, of Pendarves,
Camborne,
Cornwall. Humphrey Morris had become a successful London solicitor, following his father, Howard Carlile Morris, who was a partner in a firm he had co-founded. Howard Morris's mother, Sarah Anne Carlile, was of a Scottish family; cousins were the politician and businessman Sir
Hildred Carlile, 1st Baronet, and his brother
Wilson Carlile, founder of the
Church Army. Like his father, Morris was educated at
Charterhouse School where he was elected to a Holford Scholarship to read history at
Christ Church, Oxford, although after two terms he switched to study law. He graduated with first class honours degrees in the Final Honour School and subsequently on the
BCL. He was elected to an
Eldon Law Scholarship, but was unsuccessful in his quest for the
Vinerian Scholarship. In 1934 he was called to the Bar by
Gray's Inn, but he did not enjoy legal practice. In 1936 he left to return to Oxford at a tutor in law at
Magdalen College, Oxford where (with the exception of one year as a visiting fellow at Harvard) he would spend the remainder of his professional life. During his brief career at
the Bar, he did appear on one occasion before the
House of Lords in
Government of India v Taylor [1955] AC 491. In 1939 he married (Mercy) Jane, daughter of civil servant Stanley Asher Kinch. They never had children. ==War service==