Assistant Legal Adviser, Foreign and Commonwealth Office, London (1970-1981; 1984-1986)

Legal Adviser to the Governor of Southern Rhodesia (1979-1980)

Legal Adviser, British Embassy, Bonn (1981-1984)

Legal Counsellor, Foreign and Commonwealth Office (1986-1991; 1994-1996)

Counsellor (Legal Adviser), United Kingdom Mission to the United Nations, New York (1991-1994)

Deputy Legal Adviser, Foreign and Commonwealth Office (1996-1999)

Legal Adviser, Foreign and Commonwealth Office (1999-2006)

Rapporteur of the UN Committee on Applications for the Review of Administrative Tribunal Judgments (1991-1994)