Jones Parry joined the Foreign and Commonwealth Office in 1973 and his first posting was to the British High Commission in Ottawa as First Secretary (1974–79). He returned to the FCO to work in the European Community Department (Internal) for the period 1979–82. Following this he entered the Office of UK Representation to the European Community in Brussels as First Secretary (Energy) and then (Institutions) 1982–86. He followed this with a period as Deputy Head at the Office of the President of the European Parliament (1987–89), before again returning to the FCO as Head of European Community Department (External) (1989–93). His next overseas position was as Minister at the British Embassy in Madrid (1993–97), followed by the post of Deputy Political Director in the Foreign Office, where he was also responsible for Balkans and Aegean policy (1996–97).