[1] In 1926 Medlicott took up a post at University College, Swansea and in 1936 he married Dorothy Kathleen Coveney.
Medlicott worked at the Board of Trade for the first year of the Second World War before being selected by Sir Keith Hancock to be a member of the Cabinet Office Historical Section.
[1] In 1968 he was appointed to deliver the Creighton Lecture, published a year later as Britain and Germany: The Search for an Agreement.
He was also secretary and president of the Historical Association for six years and was prominent in the Royal Institute of International Affairs.
[1] After a proposal from Donald Read, the Medlicott Medal was established in 1985 to recognise services to history.