After a further period at the FCO as head of the Guidance and Information Policy Department (1975–1976), she was appointed British Ambassador to Denmark in April 1976[2] and remained there until 1983.
After leaving Denmark, Warburton was ambassador and UK permanent representative to the United Nations and other international organisations in Geneva (1983–1985).
Concurrently, she was a member of the Equal Opportunities Commission (1986–1988), of the Committee on Standards in Public Life (1994–1997), and of the Council of the University of East Anglia.
[5] Warburton led a European Community investigative mission into the treatment of Muslim women in the former Yugoslavia, which reported in January 1993.
[6] She died on 4 June 2015 at her home near Eye, Suffolk,[7] and is buried in the nearby churchyard of St Mary's in Thornham Parva.